Hosts Kelly Ripa and Anderson Cooper arrive at the 2017 "CNN Heroes All-Star Tribute" at the American Museum of Natural History on Sunday, December 17, in New York City. Kevin Mazur/Getty Images for CNN

CNN "Young Wonder" Sidney Keys III created a book club for boys that focuses on African-American literature and culture. Mike Coppola/Getty Images for CNN

2017 CNN Hero Jennifer Maddox is a Chicago police officer who founded an after-school program that helps at-risk kids. Kevin Mazur/Getty Images for CNN

"Stranger Things" star Gaten Matarazzo is among the celebrity presenters. Michael Loccisano/Getty Images for CNN

CNN anchor Don Lemon arrives at the 2017 CNN Heroes tribute. Michael Loccisano/Getty Images for CNN

2017 CNN Hero Khali Sweeney runs a boxing and tutoring program for kids in Detroit. Kevin Mazur/Getty Images for CNN

2017 CNN Hero Rosie Mashale founded a South African organization that helps more than 5,000 children, many of whom lost their parents to AIDS. Kevin Mazur/Getty Images for CNN

2017 CNN Hero Mona Patel created a support group for amputees like herself. The group provides peer support, education and financial help with prosthetics. Kevin Mazur/Getty Images for CNN

Actress Isabela Moner is among the celebrity presenters at the 2017 "CNN Heroes All-Star Tribute." Michael Loccisano/Getty Images for CNN

CNN anchor Brooke Baldwin on the CNN Heroes red carpet. Kevin Mazur/Getty Images for CNN

Comedian and actor Jim Gaffigan Kevin Mazur/Getty Images for CNN

2017 CNN Hero Samir Lakhani founded a nonprofit that recycles discarded hotel soap bars and distributes them to people in need. Kevin Mazur/Getty Images for CNN

2017 CNN Hero Aaron Valencia founded an after-school program that focuses on classic car restoration. Kevin Mazur/Getty Images for CNN

Grammy-nominated soul singer Andra Day will perform her hit song "Stand Up for Something" with Grammy-winning hip-hop artist Common. Mike Coppola/Getty Images for CNN

2017 CNN Hero Andrew Manzi founded a nonprofit that provides free six-week-long surf camps and therapy sessions to fellow war veterans. Kevin Mazur/Getty Images for CNN

Oscar-nominated actress Alfre Woodard Michael Loccisano/Getty Images for CNN

CNN's senior media correspondent and "Reliable Sources" host Brian Stelter Kevin Mazur/Getty Images for CNN

2017 CNN Hero Leslie Morissette founded an organization that gives computers, iPads and robots to ill children so they can stay connected to friends. Kevin Mazur/Getty Images for CNN

2017 CNN Hero Amy Wright runs a popular coffee shop in North Carolina that employs dozens of people with disabilities. Kevin Mazur/Getty Images for CNN