During the holiday season, most people are laying low and getting some R&R -- and if you're rich and famous, that means taking off on lavish tropical vacations, duh.

Droves of stars escaped to glamorous locales like Hawaii, Barbados and St. Barth's, to name a few -- but the paparazzi caught up with them! Check out Mischa Barton's slim bikini body, Simon Cowell flirting with some fans and more celebs in the sun this week!