Serena Williams shares a photo of her daughter on Halloween Serena Williams and Alexis Ohanian posted a photo of their daughter, Alexis Olympia Ohanian, Jr., for Halloween with the caption, "When you realize you’re the hero Gotham needs." on Instagram, Oct. 31, 2017. @olympiaohanian/Instagram

Salma Hayek makes dinner with Ryan Reynolds and his daughter Salma Hayek posted this photo to her Instagram account, Aug. 10, 2017. @salmahayek/Instagram

Soccer star Cristiano Ronaldo introduces his newborn twins Cristiano Ronaldo posted this photo to his Twitter account with the caption, "So happy to be able to hold the two new loves of my life," June 29, 2017. Cristiano Ronaldo/Twitter

David Beckham takes his son Brooklyn to a movie premiere Brooklyn Beckham and David Beckham attend the premiere of "King Arthur Legend of the Sword," in London, May 10, 2017. Joanne Davidson/SilverHub/REX/Shutterstock

Sharon Stone takes two of her sons to a premiere Roan Joseph Bronstein, Sharon Stone and Laird Vonne Stone attend the premiere of Penny Black Promotions' "A Little Something for Your Birthday" at Pacific Design Center, May 3, 2017, in West Hollywood, Calif. Allen Berezovsky/Getty Images

Adam Levine Celebrates His Hollywood Star With His Wife and Daughter Adam Levine, Behati Prinsloo and Dusty Rose Levine attend a ceremony honoring Adam Levine with star on the Hollywood Walk Of Fame, Feb. 10, 2017, in Hollywood, California. Tommaso Boddi/WireImage/Getty Images

Boomer Phelps Hangs by the Pool With a New Toy Michael Phelps posted this image to his Instagram account with the text, "Ladies and gentleman... today is my 8month bday... soooo I told mom I was going to play in the MLB one day," on Jan. 5, 2017. boomerrphelps/Instagram

Chrissy Teigen Does Ballet With Her Daughter Chrissy Teigen posted this photo to her Instagram account on Jan. 2, 2017. Chrissy Teigen/Instagram

Ellen Pompeo Admits She's 'Boy Crazy' Ellen Pompeo shared this image to her Instagram account of her newborn son, Jan. 1, 2017. Ellen Pompeo

Ryan Reynolds and Blake Lively's Daughter Steals the Show Ryan Reynolds' daughter James, left, steals the microphone as Reynolds poses with his wife, actress Blake Lively, and their youngest daughter during a ceremony to award him a star on the Hollywood Walk of Fame on Dec. 15, 2016, in Los Angeles. Chris Pizzello/Invision/AP Photo

Chrissy Teigen Brings Her Daughter to Meet Santa This photo was posted to Chrissy Teigen's Instagram account, Dec. 15, 2016. @chrissyteigen/Instagram

Hilary Duff Smooches Her Son at Disneyland This photo of Hilary Duff was posted to her Instagram account, Dec. 13, 2016. @hilaryduff/Instagram

Brian Austin Green Shares Pics of His Smiling Family Actor Brian Austin Green shared this image of his child to his Instagram account, Nov. 16, 2016. Brian Austin Green

Brian Austin Green Shares Pics of His Smiling Family Actor Brian Austin Green shared this image of his child to his Instagram account, Nov. 16, 2016. Brian Austin Green

Shakira Cuddles Up to Her Son Singer Shakira shared this intimate image of her son to her Instagram account, Nov. 15, 2016. Shakira

Adam Levine and Behati Prinsloo Take Newborn Dusty to the Beach Behati Prinsloo Levine posted this photo to her Instagram account, Nov. 14, 2016. Behati Prinsloo Levine/Instagram

Chris Hemsworth Bonds With His Son Elsa Pataky posted a photo to her Instagram of husband Chris Hemsworth sharing a sweet moment with their son on Nov. 6, 2016. elsapatakyconfidential/Instagram

Gwen Stefani posted this photo to her Instagram account with the caption, "Happy b day little Leo," Nov. 6, 2016. gwenstefani/Instagram

Victoria Beckham Snaps a Selfie with Cruz Victoria Beckham posted a photo with her son Cruz to her Instagram account, Nov. 1, 2016. Victoria Beckham/Instagram

Megan Fox Introduces Her 3rd Child Megan Fox posted this photo on Instagram, Oct. 26, 2016. the_native_tiger/Instagram

Padma Lakshmi Poses With Her Mini-Me Daughter Padma Lakshmi posted this photo with her daughter to her Instagram account with the caption, "Perfect Sunday for the twins today," Oct. 23, 2016. Padma Lakshmi/Instagram

Jessica Simpson Shares a Sweet Shot of Her Kids Jessica Simpson shares a photo of her two kids on Oct. 13, 2016 with the caption, "Up Up and Away #maxidrew #aceknute". jessicasimpson/Instagram

Beyonce Dances With Blue Ivy Beyonce posted photos on her Instagram account, Oct. 7, 2016. beyonce/Instagram

Reese Witherspoon Wishes Her Mini-Me Ava a Happy Birthday Reese Witherspoon posted this photo of her daughter Ava to her Instagram account, Sept. 9, 2016, with the caption, "Can't believe my baby is 17 today! I love you. Your gorgeous heart and loving spirit never cease to amaze me! I'm so lucky the universe let me be your mother. " Reese Witherspoon/Instagram

The Rock Shares a Photo of His Daughter The Rock posted this photo on Instagram, Sept. 5, 2016. therock/Instagram

Kelly Ripa Shares a Sweet Snap Kelly Ripa posted this photo on Instagram with this caption: "Saying goodbye to big bro, the college freshman. (Whilst conspiring to take over his bedroom.)" Aug. 27, 2016. kellyripa/Instagram

David Beckham Takes a Nap With His Baby David Beckham posted this photo to his Instagram account with the caption, "Nap time," on Aug. 3, 2016. davidbeckham/Instagram

Michael Phelps' Son Shows Off His Game Face United States' Michael Phelps' son Boomer wears ear protection during the swimming competitions at the 2016 Summer Olympics, Aug. 8, 2016, in Rio de Janeiro. Michael Sohn/AP Photo

Hilary Duff Shares a Sweet Snap of Her Son Hilary Duff posts an image to her Instagram account with the text, "Ghost stories....." on Aug. 4, 2016. hilaryduff/Instagram

Chris Pratt Spends the Day With His Son This photo of Chris Pratt and his son are seen in this photo posted to Anna Faris' Instagram account, July 22, 2016. @annafaris

Zoe Saldana Shares a Photo of Her Twins Zoe Saldana posted a photo on her Instagram account on July 21, 2016. zoesaldana/Instagram

John Legend Shares Sweet Snap of Daughter, Luna, While on Vacation John Legend shared this image of his daughter while on vacation to his Instagram account, July 20, 2016. John Legend

Michael Phelps Takes a Dip with His Son Michael Phelps shared this image to his Instagram of his newborn and their time in the pool, July 6, 2016. Michael Phelps

Milla Jovovich Takes Her Mini-Me Daughter to Paris Fashion Week Milla Jovovich and her daughter, Ever Gabo, attend the Chanel Haute Couture Fall/Winter 2016-2017 show as part of Paris Fashion Week, July 5, 2016, in Paris. Pascal Le Segretain/Getty Images

Mariah Carey's Kids Celebrate the Fourth in Style Mariah Carey shared this adorable image of her twin children celebrating the Fourth of July to her Instagram, July 4, 2016. Mariah Carey

Neil Patrick Harris Spends the Day With His Adorable Family Neil Patrick Harris shared this image of his husband and children while on vacation, June 29, 2016. Neil Patrick Harris

Sarah Jessica Parker Shares a Photo of Her Twins on Their 7th Birthday Sarah Jessica Parker shared this image of her twin daughters to her Instagram account to wish them Happy Birthday, June 22, 2016. Sarah Jessica Parker

Chrissy Teigen Shares a New Photo of Her Daughter With John Legend Chrissy Teigen posted this photo of her and John Legend's daughter to Instagram, June 19, 2016. Chrissy Teigen/Instagram

Kelly Ripa Celebrates Her Son's Graduation and Her Daughter's Birthday Kelly Ripa posted a photo on her Instagram account, June 17, 2016. kellyripa/Instagram

Michael Phelps Shares Sweet Pic of Son Michael Phelps posted this photo on Instagram with this caption, "Boomer says what's up y'all!!!" m_phelps00/Instagram

This photo of Mariah Carey and her children was posted to her Instagram account, May 30, 3016. @mariahcarey/Instagram

Soleil Moon Frye Introduces Her Son Story Soleil Moon Frye posted an image on her Instagram account in May 2016. moonfrye/Instagram

John Legend Shares a Sweet Photo of Their Adorable Baby John Legend posted a photo on Instagram with this caption: "Burpface," May 18, 2016. johnlegend/Instagram

Whose Son Made S'mores for the First Time? Chris Pratt posted this photo of his son, Jack, making s'mores for the first time to his Instagram account, May 16, 2016. @prattprattpratt/Instagram

David Beckham Shares Sweet Pic of Daughter Harper A screen grab from a video posted to David Beckham's Instagram account of his daughter Harper, May 11, 2016. David Beckham/Instagram

Whose 22-Month-Old Daughter Loves Ice Cream? Jimmy Kimmel shared this photo of his daughter on Jimmy Kimmel Live, May 1, 2016. Jimmy Kimmel Live

Anna Faris Cuddles Up to Son Jack This photo was posted to Anna Faris' Instagram account on May 8, 2016 with the text, "Here is Anna on Mother's Day with our twin sons Jack and T-Rex. Even now it's hard to tell them apart some times." prattprattpratt/Instagram

Gwen Stefani Poses on the Red Carpet With Her Niece Stella Stefani and Gwen Stefani attend the 2016 Radio Disney Music Awards, April 30, 2016, in Los Angeles. Lionel Hahn/Abacausa/startraksphoto.com

Whose Little Girl Is Almost Four Years Old? Jessica Simpson shared this image of her daughter, who will turn 4 yrs old on May 1st, to her Instagram account, April 25, 2016. Jessica SImpson

Chris Pratt Shares a Sweet Photo of His Son Chris Pratt posted this photo to his Instagram account, April 21, 2016, with the caption, "This morning Jack found a rainbow on the wall. I honestly couldn't figure out where it was coming from which according to science means it's some sort of portal. You ever see Stargate? Exactly. We were careful not to get too close. I snapped this photo and it dawned on me how much Jack looks like Anna. They are both so beautiful. Sleeping in with the two of them is my greatest treasure." Chris Pratt/Instagram

John Legend Shares a Photo of His Newborn Daughter Luna John Legend shared this image of his newborn daughter, Luna, to his Instagram, April 20, 2016. John Legend/Instagram

Drew Barrymore Enjoys Mother-Daughter Yoga with Olive Drew Barrymore this image of herself doing yoga with her daughter to her Instagram account, April 7, 2016. Drew Barrymore/Instagram

Khloe Kardashian, Penelope Disick and North West Sport Matching Braids Khloe Kardashian, Penelope Disick and North West are seen here in this image posted to Kim Kardashian's Instagram account, April 4, 2016. @kimkardashian/Instagram

Alicia Keys Shares a Photo of Son Egypt Alicia Keys shared this image of her son, Egypt, in a video she posted to her Instagram account, March 29, 2016. Alicia Keys/Instagram

Cindy Crawford's Children Hit the Red Carpet Presley Gerber and sister Kaia Gerber are seen at the Daily Front Row's Fashion Los Angeles Awards in Los Angeles, March 20, 2016. Gilbert Flores/Broadimage

Gwen Stefani Performs with Her Boys By Her Side Gwen Stefani, Kingston Rossdale, Jimmy Kimmel and Apollo Rossdale are seen at 'Jimmy Kimmel Live,' Feb. 16, 2016, in Los Angeles. GC Images/Getty Images

Drew Barrymore Gives Her Daughter a Kiss Drew Barrymore posted an image to her Instagram account, Feb. 15, 2016. drewbarrymore/Instagram

Tobey Maguire and His Family Take in a Fashion Show Actor Tobey Maguire, Ruby Maguire, designer Jennifer Meyer, in Saint Laurent by Hedi Slimane, and Otis Tobias Maguire attend Saint Laurent at the Palladium, Feb. 10, 2016, in Los Angeles. Kevin Mazur/Getty Images

Coco Shares a Sweet Snap of Her Daughter Coco posted this photo on Instagram with this caption, "My little lovebug... This is the new sneaky look she gives," Jan. 28, 2016. coco/Instagram

Channing Tatum Shares a Sweet Photo of Everly and Their Goat Channing Tatum posted an image of his daughter on his Instagram account, Jan. 26, 2016. channingtatum/Instagram

Hilary Duff's Son Gets Ready for School Hilary Duff posted this image of her son getting ready to go to school with the caption, "Strut," on Jan. 19, 2015. hilaryduff/Instagram

Whose Son Is 'Behind Bars'? Olivia Wilde posted a photo of her son on her Instagram account on Jan. 5, 2015 with the message: "Finally behind bars. #heartthief." oliviawilde/Instagram

Daphne Oz Shares the First Photo of Her New Son Daphne Oz shared this photo of her newborn son to her Instagram, Jan. 5, 2016. Daphne Oz/Instagram

Reese Witherspoon and Son Enjoy Time by the Pool A photo posted to Reese Witherspoon's Instagram on Jan. 3, 2016 with the caption, "Last day of vacation!" reesewitherspoon/Instagram