Jordin Sparks Shows Off Weight Loss in Bikini Self-Portrait

The 2007 American Idol winner shows off her svelte new bikini bod in a picture on Twitter

Jordin Sparks is ready for bathing suit season! The 2007 American Idol winner, now 21, showed off her impressive weight loss on Sunday night when she took a Twitter self-portrait in a teeny polka-dot bikini.

"I don't know why but my bathing suit reminds me of fruity pebbles," the newly buff singer tweeted with a smiley face.

Sparks, who was just 17 when she won Idol, has reportedly lost 30 pounds in the past year by working with a personal trainer.

"It was just a shift in my thinking," Sparks tells People of her new lifestyle. "Instead of talking about being more active, I just got up and did it." She adds: "There's no secret. Anybody can do it."

Last month, the singer -- who claims she doesn't diet -- shared a bit of her fitness routine with Us Weekly.

"I've been hiking and I've done a couple of runs," said Sparks. "I also do Zumba. It's so much fun!"

Sparks is going to need that energy this summer, when she opens for the New Kids on the Block/Backstreet Boys tour. She's also set to sing the national anthem at the Kentucky Derby on May 7.

It definitely sounds like Sparks has worked hard to get her amazing abs. But if you don't have access to a personal trainer, you can at least copy her standout swimwear look: Sparks tweeted that the bikini top is from Target, and the bottom is from Old Navy!

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