is officially 50! The legendary model celebrated her special day on December 4 by sharing new via Instagram. Tyra dazzled in nothing but a cozy grey robe as she snuggled up on her couch in front of a virtual birthday cake. “50. I can’t believe I’ve been on this earth that many years,” her lengthy caption began. “I remember like yesterday my mom’s 50th birthday party and we celebrated her in the biggest way. It was a big one. And now it’s mine.”