Pictures show the relaxed model (who had some redness and tan lines on her back from not enough sunscreen) frolicking in the surf with her family. She even shared a kiss with her billionaire husband -- Peter Brant, 63 -- with whom she was involved in a bitter divorce battle only a year ago.
The family is staying in a luxury mansion on the island which rents for $28,000 a day.
Also enjoying the vacation were children Lily, 6, Harry, 13, and Peter Jr, 17. The eldest child caused something of a stir in January when pictures of he and his mother on the same beach surfaced, showing them looking extra-affectionate.
The teenager, who is becoming a fixture on New York's social circuit in his own right, later responded to the criticism, calling "the beach kiss scandal ... a malicious attack."
Britain's Daily Mail reported the piquant detail that Seymour and her young children happened upon Yves Saint Laurent designer, Stefano Pilati, on the beach, who was sunbathing nude.
"The fashionista wrapped himself up quickly for his encounter with the former model and her children," the paper noted.
Stars in Bikinis
See Stephanie Seymour and other stars as they bare it all in bikinis.