Happy birthday, McKayla Maroney! The gymnast and internet sensation can now legally vote -- she turns 18 today. The reigning world champion on the vault and a member of the gold-medal-winning Team USA at the 2012 Olympics, Maroney is one of the most recognizable gymnasts in the world. After falling on her second vault attempt during the individual event competition at the London Games, the California native and huge favorite on the vault failed to clinch the gold medal and instead took home the silver. Her “unimpressed face” from the podium instantly went viral and made her a household name. Since the Olympics, Maroney has resumed competitive gymnastics and reclaimed her status as the world’s best vaulter in October. She has also appeared in a handful of episodes of “Hart of Dixie” and hopes to pursue an acting career when she retires from the sport.