Heidi Klum‘s ringing in the new year in a new bikini … stunning in a baby blue number that left little to the imagination.

The actress and model hit the beach in St. Barts again with her husband, Tom Kaulitz, Friday … strutting around the shore in the skimpy two-piece.

Check out the pics … Heidi’s top barely contained her cleavage — and her thong-style bottoms put her entire backside on display.

After a soak, the two retreated to the shore where they cuddled on a beach towel … drinking in the rays — and keeping each other warm with their hot bods.

Shockingly, this is actually more clothes than we’ve seen Heidi wear at the beach in recent weeks … remember, we shared photos with you of Heidi sans top while hanging with Tom a couple times in the last week.