That is until the 20-second teaser clip of their new song Something New shown above.
In the footage, Cheryl Cole, Kimberley Walsh, Sarah Harding, Nadine Coyle and Nicola Roberts are seen wearing matching bright orange tulip-skirt dresses as they march away from the camera on a monochrome set.
With their backs to the camera, they can be seen sporting top knot hair styles. The clip cuts off just before they turn around.
A radio release date for the song has now been brought forward after it was leaked online to the delight of fans.
The pop group, who first found fame in 2002 on ITV show, Popstars: The Rivals, are making a special announcement on Friday, expected to be confirmation of a Greatest Hits album and tour.
Band members are counting down to the Girls Aloud's official announcement on their Twitter pages, with Cheryl teasing about the lyrics to the new track.
She wrote: “I just wanna dance.”
Responding to positive online messages, Londonderry songbird Nadine added: “I am so glad you like it so far. You all didn't know we did that right? So many secrets! Evil laugh. Hahahahaha.”
Girls Aloud will be hoping to match their pre-break success, which includes six albums that have sold nearly 2m copies.
They have had three number one singles and a further 16 top 10 hits over their seven-year chart reign.
Their last single release, Untouchable, was released in April 2009 and was their lowest-charting single, reaching a respectable 11 in the UK charts.
Last week, when Cheryl’s new book, My Story, was published, she referred to her Derry band mate, as the “lead singer” of Girls Aloud.
While Nadine is widely |regarded as the best singer |in the group, Cheryl’s profile has been much higher since Girls Aloud “took a break”.
Earlier this year the five women met up with each other for the first time in two years, which Cheryl said proved they “haven’t had fallouts the Press would like to think we have”. “We’ve simply grown into women, and have different lives to the ones we had as young girls,” Cheryl said.
“But when the five of us were together again it was like we’d never been apart.”
Fameometer .... what have they done since?
She was given £100,000 to model Ultimo lingerie. She took on acting roles, but has mainly hit headlines for her turbulent personal life, including a stint in rehab. Her debut single is ‘Breakdown’, expected to be released in January 2013.
She was a guest judge for ITV’s Born To Shine. She teamed up with Alfie Boe to record a version of Queen’s One Vision as the official Olympic Team GB single. Kimberley starred as Princess Fiona in Shrek the Musical and is currently competing in Strictly Come Dancing with Pasha Kovalev.
She released her debut solo album Insatiable in 2010 through her own label, Black Pen Records in partnership with Tesco. It reached 47 on the UK Album Charts. The US-based Derry woman also owns a pub — Nadine’s Irish Mist in Orange County.
She launched a brief solo career before turning to songwriting. She has been focussed on her Dainty Doll make-up line, was a guest judge on Britain’s Next Top Model and mentor on fashion reality show Styled To Rock.
Cheryl’s first solo single became the fastest selling of 2009. She has released three solo albums and was a judge on X Factor UK. She had a cameo role in a Hollywood film and is the face of L’Oreal.
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