Duffs and Simpsons Go At It

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.

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