Both Nicole Richie and Ashlee Simpson showed off a little skin south of the border this weekend as they strutted their stuff in some skimpy swimwear. Mother-of-two Richie, who just turned 30, proved that age is nothing but a number while sporting a black-two piece during a girls' getaway in Los Cabos with a few friends, including Samantha Ronson and Juliette Lewis. MORE: Dueling Bikini Shots of the Day—Gwen Stefani vs. LeAnn Rimes Meanwhile, Simpson could be seen in a black polka-dot bikini as she...

Avril Lavigne really has extended her French Riviera bikini vacation into the realm of the 'thank you very much', with yet another romp aboard the S.S. Hottie, this time, in a lovely shade of violet, to flash her petite but sextastically tight bikini body for the benefit of oglers with telescopic lenses everywhere. While I can't actually peel my eyes from shots of this little Cannuckian diva's frontside, I must admit, my very favorite view may be the visual of her Mediterranean-doused bottomside...