Rumor has it that two pairs of celebrity siblings are beefing big time.

Hilary and Haylie Duff were celebrating a friend's birthday at Basque in L.A. when Ashlee Simpson allegedly approached the girls' table, and blatantly remarked that Hilary's arms looked "chunky."

Haylie allegedly stuck up for her little sis and told Ashlee to beat it. Later that night in the little girls room, Haylie allegedly had some words for Jessica, according to sources.

RELATED PHOTOS AND ARTICLES
Ashlee Simpson - Chicago 10th Aniversary Gala BenefitAshlee Simpson - EuroTrip Movie PremiereAshlee Simpson - 2006 Clive Davis Pre-GRAMMY Awards PartyAshlee Simpson - Spring 2003 WB Winter Press Tour PartyAshlee Simpson - 2006 Clive Davis Pre-GRAMMY Awards PartyAshlee Simpson - 3rd Annual Glamour Magazine Hosts Signature Don't Party
Paris' Newest Boy Toy Admits To Feelings For His First Love Ashlee SimpsonAshlee Simpson Says She Loves How She Looks Now
Ashlee Simpson Believes Plastic Surgery Should Be "Personal Choice"Pete Wentz Launches New York Bar Open For Sex
Ashlee Simpson Loves Dating Surfer DudesMary-Kate Reportedly Got A New Nose
BE THE FIRST TO COMMENT ON THIS STORY!
Name: (optional)
E-Mail: (required, but never displayed)
Remember your info for next time?
Profanity and other defamatory language is not allowed. Please keep it clean.