Gwen Stefani: Bikini Babe in St. Bart's!

Gwen Stefani shows off her toned tummy while vacationing bikini-clad with her family — husband Gavin Rossdale and sons Kingston, 3, and Zuma, 16 months — in St. Bart’s on Monday (January 4).

The 40-year-old No Doubt celebrated New Year’s by performing an hour-long set at the private party of Russian billionaire Roman Abramovich. The swank event was attended by Lindsay Lohan, Orlando Bloom and his girlfriend Miranda Kerr. Also in attendance: Marc Jacobs, Linda Evangelista, Brett Ratner, Jon Bon Jovi, Eddie Murphy and Jason Statham.