Sarah Michelle Gellar and Freddie Prinze, Jr.'s family is growing!The Ringer star has just announced that she is pregnant with her second child, and "She and Freddie are thrilled. They're amazing parents," a source confrims to US Weekly.The couple met while filming the 1997 horror flick I Know What You Did Last Summer, tied the knot in Mexico on September 1, 2002, and welcomed daughter Charlotte Grace in September 2009.Prinze has been taking on the role of Mr. Mom recently with little Charlotte, while Geller has been hard at work filming the first season of her hit new show, The Ringer.The Buffy the Vampire Slayer star recently said of her hubby's new role as a stay-at-home dad, "He loves it. We fight over who gets to stay home. You'd think it would be the opposite, that the parents would be like, 'No, I'll go to work!' but he's like, 'You stayed home for two years! It's my turn! He and Charlotte have too much fun," Gellar added. "I'm jealous!"Congrats to the happy couple!