See Heidi Klum’s Sexy Beach Style

 CiaoPix/; Fame Pictures; Fame Pictures

That's one hot mama!

Heidi Klum enjoyed some fun in the sun with her family in Porto Cervo, Sardinia this past weekend while showing off her magnificently maintained supermodel frame in three different itty bitty bikinis.

On Tuesday, the mom-of-four flaunted her age-defying physique in a multicolored bikini. The day before, she sported a pink gingham two-piece.

Sunday, however, was the real show-stopper: the 38-year-old joined her brood (Leni, 7, Henry, 5, Johan, 4, and Lou, 22 months) and husband Seal on the Italian island's coast, clad in a black string bikini. But despite the hot temps, she wasn't too shy to go topless while basking in the sun's rays.

From the looks of her lean and svelte bod, Klum's Summer Run initiative definitely paid off. The supermogul kept a log of her 36 runs (131 miles) on her AOL lifestyle blog, where she jogged with celeb trainer David Kirsch and fit celebs like Brooklyn Decker and Kim Kardashian.

In addition to early morning NYC runs, the Project Runway host has been certainly keeping busy this summer. She spent last month promoting the Lifetime show's ninth season, which premiered July 28. She's also gearing up for the September launch of her costume jewelry line with QVC called Wildlife by Heidi Klum.

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