By Leah Ornstein – Radar Style & Beauty Editor

Labor Day weekend is over and you know what that means — it’s back to school!  To get you pumped up to hit the books, RadarOnline.com has photos of the hottest Hollywood stars who have pursued education past high school, stripped down and showing off their covetable curves in barely-there bikinis.

Is it any coincidence, that a slew of critically acclaimed thespians are also brainiacs? Academy Award winners Natalie Portman and Sandra Bullock both graduated from college, while Jennifer Connelly and Emma Watson both have experience in the Ivy Leagues.

PHOTOS: Sexy Stars Who Went To College

Gwyneth Paltrow and Angelina Jolie have more in common than Brad Pitt. Both the Academy Award winning beauties briefly studied at universities.

PHOTOS: Bikini Babes At Every Age

Maggie Gyllenhaal and Julia Stiles both graduated from the prestigious Columbia University, where soulful songbird Alicia Keys also took classes.

PHOTOS: Bikinis! Oscar Winners Stripped Down

What other sexy stars have studied at universities? Click here to find out.