Saturdays single 'penned by Busted star'

The Saturdays' new single 'Forever Is Over' was written by former Busted star James Bourne, it has emerged.

The girl group, who are currently putting the finishing touches to their second studio album, reportedly paired up with Bourne to create a "rockier" sound distinct from their labelmates Girls Aloud.

"'Forever Is Over' will be the song which finally distances The Saturdays from all the Girls Aloud clones remarks," a source told the Daily Star.

"It's totally unlike anything they've ever done before. It's a big 'F*** you' to a boyfriend after a break-up, and sounds like nothing Girls Aloud would ever release either.

"Everyone around the band is very excited as they've really started to hone their own sound. James wrote all of Busted's number ones, and a massive bunch of McFly hits too, so he knows what he's doing when it comes to pop and rock with a mainstream edge."

The Saturdays reportedly threatened to go on strike recently after claiming that their management were working them too hard.

'Forever As One' will precede the girl band's second album, scheduled for release in October.