Britney Spears is back in a bikini.

The 27-year-old mother of two showed of her toned tummy at a photo shoot at the Ritz Carlton in Los Angeles Thursday.

See Britney's bikini body through the years.

Late last year, Spears had begun intense training to ready for her worldwide Circus tour.

Usmagazine.com reported she shed 20 pounds, thanks to two-hour cardio-and-strength-training workouts three times a week (on top of dance rehearsals).

See this summer's sexiest bikini bodies.

"I have had to work hard at getting [my body] back to where it used to be," she told Glamour earlier this year. "I used to be obsessed with working out ... But I can't get motivated right now because I'm so focused on my music."

Can you guess whose bikini body this is?

Spears will receive a special award at this year's Teen Choice 2009.

Spears, the female artist with the most Teen Choice surfboard awards, will be honored with the ultimate choice award for her "extraordinary contributions to the entertainment industry," FOX said in a statement Thursday.

Check out more pics of Britney in a bikini at Thursday's photo shoot.

The show airs on Fox Monday at 8 p.m.

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