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What does Jennifer Aniston want for her 41st birthday? She already has the hair, the smile—and that body. But the star, who turned 41 on Feb. 11, wouldn't be complete without friends such as Courteney Cox Arquette, Sheryl Crow and Kathy Najimy. "Her friends are her family," says a pal. So what could be better than a family vacation at the posh One&Only Palmilla resort in Los Cabos, Mexico? On Feb. 5 Jen hosted a fiesta with a mariachi band and muchas margaritas. "You could feel the warmth," says a source. The next day the group tanned by the Sea of Cortez and then got their '80s on at a dance party in Jen's private villa. The birthday girl boogied with Cox and Gerard Butler (she and the sexy Scot are just buddies). "Jen danced all night," says the source. "She had a wonderful time."

  • Contributors:
  • Reported by Pernilla Cedenheim,
  • Jennifer Garcia.