Washington, Mar 9 : Performing for Britney Spears' Circus tour is a unique challenge for the Pussycat Dolls - because her high-tech round stage means they must move at all times to keep fans from staring at their backsides.

The girl band is the support act on the `Toxic' hitmaker's 42-date Circus trek, which features a massive circular platform in the centre of the venue.

And the Pussycat Dolls have realized the curved stage means they must dance throughout the entire show - so audiences can focus on something other than their bottoms.

"It''s hard because your butt cheeks are always facing part of the crowd," Contactmusic frontwoman Nicole Scherzinger, as saying.

"So you constantly wanna keep it moving and be able to spread the love everywhere - even though your backside is to some of the people," she added. (ANI)