Posted on Wed Jul 28th, 2010 3:55pm PDT
Hilary and Haylie Duff are sisters slash gym buddies! The two Hollywood starlets - one more famous than the other - penciled in a workout together this afternoon and left looking all buff and muscled-up. And wearing matching black tanks (and shades), no less! Two cute.
SEE THE GALLERY Hilary And Haylie Work It Out
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