Who knew Rachel Bilson had such a bangin’ backside?

The Hart of Dixie star gave Kim Kardashian some curvy competition, stripping down into a skimpy black bikini and flaunting her bombshell booty, while vacationing with her on-again-off-again boyfriend Hayden Christensen in the Caribbean – and RadarOnline.com has the scorching hot photos.

Rachel Bilson has a few things she wants to clear up, so what better way to get her message across than with a rap video?

The Hart of Dixie actress, who has encountered a bit of backlash from critics saying that she wasn’t cast properly as a doctor on her hit show because of the way she looks, acts and dresses, stars in a hilarious new Funny or Die video titled Call Me Doctor, where she blasts back at her haters and slams her former The O.C. costar Mischa Barton.

Proving that she can not only act, but drive people to hysterics, the petite actress, who wears a faux grill in the video, explains in her rap that despite keeping busy since The O.C. days with various television and movie roles, people act like she has done nothing – when it is her former costar
who should be getting the heat.