Lindsey Vonn turns 29 on Friday. The gold-medal winning skier, who appeared in the 2010 SI Swimsuit issue, is headed to Austria on Monday as she continues her rehab by competing at next week's World Cup opener. It's been an interesting year for Vonn. In February, she shredded her anterior cruciate and medial collateral ligaments in a crash at the world championships in Schladming, Austria. A month later, she went public with her relationship with Tiger Woods. The couple met at a charity event in 2012. Since then, Vonn has focused on her rehab and getting ready for the the 2014 Olympic Games in Sochi, Russia. But we're sure she'll find time to celebrate. After all, you only turn 29 once!