She wore an itsy-bitsy, teeny-weeny, yellow polka-dot bikini. And boy, did she work it!

Hitting a Hawaiin beach with on-off boyfriend Jason Trawick, mother of two Britney Spears showed off her buff bikini bod in a barely there number that proved she's back in fighting form, reports the Daily Mail.

Clad in a tiny yellow two-piece with grommet-like dots and gold-chain embellishments, the 28-year-old bronzed singer revealed her famously taut tummy and toned dancer's legs.

"Recently I started to appreciate my body a bit more from before I had kids. But it completely changed, and I have had to work hard at getting it back to where it used to be," Spears, who hits the gym three days a week, told Glamour. "It makes me feel good and feel like I've done something. It's important to take care of your body."

But apparently, Spears is a bit more modest when it comes to her rear view: Perhaps sensing the presence of the paparazzi, she used a towel to cover her tush when she turned around.

In other news, see which singer recently channeled Spears during a recent "Today" show performance.