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Once the queen of junk food, Britney's trading in her love of cheese puffs for sushi.

Stylist GK Reid, who worked on Brit's upcoming 3 video, told Page Six, "She exhibited amazing energy and was in great shape -- her body looked better than it has in years." And here's why: "She munched on sushi instead of junk food, and even sang live with the words. She worked really hard and was really sweet to all the dancers."

Although Brit's body has been rockin' as of late, do you really think she'd permanently give up on frapps and cheese puffs or as soon as her tour is over and all her videos are in the can, she'll go right back to her first love?