Gwen Stefani was in a red bikini this afternoon as she hit the beach in St. Barts with Gavin Rossdale and their sons. She also broke out a black two-piece on Saturday for a boat ride with Zuma and Gavin, who was shirtless yesterday for another trip out to sea with Kingston.

The Stefani-Rossdales spent the month of December together in London, before trading Gavin's hometown for the warmer climate of the Caribbean island. Their New Year's celebrations were equally hot, as they rang in 2010 with the other stars at Roman Abramovich's estate — Gwen took the stage at his bash, and reportedly was paid over $500,000 for doing so.

More photos of Gwen, Gavin and the kids so