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Members of Girls Aloud were pictured leaving a recording studio last night, sparking rumours that they're working on a new album.

But what's more Mark Ronson was seen leaving the studio shortly after Girls Aloud members Nicola Roberts and Kimberly Walsh.

The girl group have kept quiet about any plans beyond next year's reunion tour to mark their tenth anniversary, and have been reluctant to talk about the possibility of recording new material.

Some sources have suggested that the two singers were simply working on recordings for their own solo projects, while others believe the recording sessions were for backing tracks for the upcoming shows.

The girls' latest retrospective, Ten, was released last month and features recent release 'Something New' and upcoming single 'Beautiful 'Cause You Love Me'.

The girls recently admitted to having to use lyric sheets during rehearsals for their appearance at the Jingle Bell Ball.

"We needed lyric sheets for every single song," Kimberly confessed. "It was so funny."

In other news, it was recently announced that Cheryl Cole is suing the producers of X Factor USA for loss of earnings after she was fired from the show.

The 'Parachute' singer was contracted to appear on two seasons of the show. She was to recieve $1.8million for the first series, which was paid, and a further $2million for the second. It is the second season earning that she is suing for.

Girls Aloud pictured together after announcing their anniversary tour

Cheryl allegedly recieved £1.1million just for appearing at auditions in two cities before she was given the boot, supposedly on account of her accent.

There had been rumours that she would return to the UK version of the show as a judge as part of an overhaul of the show in response to a ratings slump this year.

But earlier this week a close friend and a spokesperson for the singer both confirmed that Cheryl had no plans to return to the show.

Photos: ten years of Girls Aloud - what a difference a decade makes