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Sun, sand and stretching ... sexy model Stephanie Seymour likes to do it all!

The 44-year-old former Sports Illustrated cover girl frolicked in the beautiful waters of St. Barth with her young daughter Lily and hubby Peter Brant.

Ms. Seymour must be taking frequent dips in the fountain of youth because she looks fabulous. What a bikini body!

See more of the brunette beauty in our gallery below.