Olympic gymnast McKayla Maroney is bursting out her braless dress in sexy thigh-highs for a surprise Valentine's Day treat. The 25-year-old vault queen, best known for her viral "unimpressed" face at the London 2012 Olympics, impressed everyone around on Sunday, posting for her 1.3 million Instagram followers and celebrating the most romantic day of the year. McKayla's photo was sun-drenched, all little red dress and plenty of leg, with the gymnast snagging herself likes in no time. See why below.