Britney Spears is back to her bloated ways after scoffing calorific goodies over Xmas, according to a new report.

The pop princess - who has been working hard to keep in shape for her comeback - is said to have let herself go over Christmas, indulging on her favourite foods.

A source says, "Britney has been working hard to get back to something like the form she used to have but Christmas is too much of a temptation for her.

"Going home for Christmas with all that food was just too much to deny herself. She indulged herself for a few days but now she's had to promise to get it all off again fast.

"This is a big year for her coming up and she can't afford any more issues with her image."

Looks like we know what Britney's New Year's resolution will be...

See Britney's changing shape below