Britney Spears appears to have lost a great deal of weight and really gotten herself back in shape.

Ten months after she was spotted on stage in London looking a tad plump— and years removed from when she said she looked like "a fat pig" at the 2007 MTV Video Music Awards— she uploaded a picture to Twitter last night that showed how far she'd come.

"Having some fun in the sun... don't want summer to be over," she wrote, along with the photo.

"OMG...your lookin fit & hot,” will.i.am replied to her. “can't wait to shoot the video to our song...your fans are gonna love it.”

Spears will be showing off that bod in some capacity or another on X Factor, which has its season premiere on September 12th on FOX.

[via Radar Online]