Britney's Back in a Bikini.

Britney's Back in a BikiniThe singer (and mother of two), 28, showed off a toned bod Tuesday while vacationing with beau Jason Trawick in Hawaii.The "Gimme More" singer proudly donned a skimpy yellow two-piece swimsuit.Britney Spears who recently taped an episode of Fox's Glee -- can now be seen as a Japanese bride on the September cover of Pop magazine."I just saw the photos for the first time