From birthday bashes to A-list events, these stars (J.Lo! Rihanna!) will take any excuse to get their party on!

Source: http://www.ivillage.com/photos-celebrities-partying/1-b-447336?dst=iv%3AiVillage%3Aphotos-celebrities-partying-447336

Amber Brkich Amber Heard Amber Valletta America Ferrera Amerie Amy Cobb Amy Smart Ana Beatriz Barros Ana Hickmann Ana Ivanovi