Who Has the Hotter Black Swimsuit: Hilary or Haylie Duff?

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Hilary Duff
65% 1532
Haylie Duff
35% 808
Celebrity Style Aug. 1, 2011 AT 5:10PM
Who Has the Hotter Black Swimsuit: Hilary or Haylie Duff? Credit: G Tres/Splash News Online (2)

Sexy siblings!

Hilary and Haylie Duff showed off their curvy figures in revealing black swimsuits while vacationing in Mexico on Sunday.

Hilary, 23, chose a strapless look with an intricate string design in the back. Her sister, 26, opted for something with a plunging front and cut outs at the sides.

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Both girls wore their hair swept back into high buns and hung out by the pool while Hilary's husband of one year, hockey player, Mike Comrie, relaxed on a raft.

Last month the couple hit up the Island of Capri, Italy, where the actress posed in a teeny black bikini while Comrie, 30, took pictures of her in a lagoon.

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How does Duff -- who shot to fame on Disney Channel's Lizzie McGuire in 2001 -- stay in such great shape?

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"I work with a trainer named Harley Pasternak and I do a lot of Pilates," she told Us Weekly in April. "I'm just like everyone else. I go through stages where I feel super motivated and want to work out every day, and then I won't work out for two or three weeks and I'll feel like s**t. Then it's time to hop back on the wagon again!"

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