Britney Spears is set to heat things up again by joining the racy Pussycat Dolls in a new video.

The singer has apparently agreed to star in the girl group’s promo for new single ‘When I Grow Up’.

“She is doing a cameo in their new video shoot today,” a source told Metro.

Britney Spears was spotted at Burbank, LA, the location of the group’s video shoot, yesterday.

The clip will unlikely be a vanilla affair with the US girls famed for prancing in suspenders and humping chairs.