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It's no secret that our girl Britney loves fast food -- Del Taco on Saturday, Carl's Jr. on Sunday, and then Carl's Jr. again yesterday -- whew! Girl must be workin' it good over at Millennium because her body's lookin' hot!

Check out Britney leaving the dance studio yesterday afternoon, with her bodyguard carrying a chair out of the studio (naw, she's not preparing to put on a show!) and cousin Alli carrying little Sean out of the studio. All the dancing must have worn him out because he couldn't even stay awake for lunch.

more pix inside ...