Britney 'keeping to herself' on tour

Pussycat Dolls singer Ashley Roberts has admitted that the group have little contact with Britney Spears while they tour with the star.

The girlband have been supporting Spears in gigs across the US and Canada since her Circus tour kicked off in March.

"Unfortunately there isn't much time for us to hang out," Roberts told the Daily Star.

"We pop into our dressing rooms, change into our outfits and then go straight out on stage.

"I've seen her in passing through the hallway but she kinda keeps to herself and so do we."

Roberts also admitted that Spears has been outshining her special guests in the fashion stakes thanks to some daring choices.

"Britney is totally outdoing us on outfits. She has some outrageous costumes and I definitely think between us we've taken every rhinestone that's ever been made," she explained.

"It's amazing to be supporting her. She's out there every night doing her thing and we feel so lucky to be a part of that."