POP princess Britney Spears has packed on the pounds, and her legs have erupted in a gnarly mass of cellulite!

The 32-year-old star has been using wardrobe tricks to cover up her flab while performing onstage for her Las Vegas show, “Piece of Me,” at Planet Hollywood, sources say.

But the show is now on hiatus, and our sources say the “Toxic” singer isn’t do­ing anything to whip herself back into shape.

“Britney has gained close to 30 pounds, and she’s got a lot of cellulite on her legs and stomach,” an insider told The ENQUIRER.

“To disguise her belly onstage, she wears a one-piece leotard made out of a shaping material for a slimming effect.

“Skin-colored tights cover her legs during her act, and she also likes to use tanning beds and spray tans to hide her cellulite, but it looks ridiculous.”

The show doesn’t resume until Aug. 15, and the mother of two is totally letting herself go, added the source.

“Britney isn’t using her home gym, and she’s gorging on junk food,” said the source.

“She loves McDonald’s and Taco Bell, and she’s eating tacos, corn bread and fried chicken. She also drinks Cokes and fatty frappuccinos from Starbucks.”

But Britney apparently has a plan to drop her extra weight. “She’s going to have prepackaged meals delivered to her house about two weeks before her show starts again,” said the source.

“However, that plan didn’t work during her hiatus last year, and it’s not likely to work this time around either.”