What will the neighbours say? Girls Aloud stars have boozy New Year's Eve celebrations...while fans watch their flawless Top of the Pops performance

PUBLISHED: 11:53 EST, 1 January 2013 | UPDATED: 11:55 EST, 1 January 2013

While fans of reunited girl group Girls Aloud watched them open the New Year's Eve Top of the Pops on Monday, the girls themselves were having a little celebration of their own.

The singers, who have recently released their greatest hits album, wowed the studio audience with their pre-recorded performance of Something New but Kimberley Walsh and BFF Nicola Roberts were having a boozy evening in.

The Strictly Come Dancing runner-up and her band-mate posted pictures of themselves enjoying a few glasses of red wine to toast 2013 and to celebrate a great year.

Toasting the new year: Nicola Roberts posted a picture of her and Kimberley Walsh enjoying a boozy New Year's Eve

Top up: Nicola tops up their glasses. while fans watch Girls Aloud perform on Top of the Pops

To round off their reunion year, which marked ten years since the band formed, the five stars took to the Top of the Pops wearing matching white tulip-style dresses.

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Singing in unison from microphone stands and later with writhing male dancers around them, the girls were back to their best and quashed the continuing rumours that they weren't friends.

Cheryl Cole wore her trademark dark hair long and wavy over her shoulders, as did a sultry looking Sarah Harding, while Kimberley showed off her newly-cut dip-dyed bob.

Flawless performance: The group performed on the New Year's Eve Top of the Pops special

Great end to the year: The girls rounded off their reunion year with the pre-recorded performance

The group joined a host of the year's biggest stars including Rita Ora, Stooshe, Tinie Tempah, Calvin Harris and Ellie Goudling, while Reggie Yates and a heavily pregnant Ferne Cotton presented.

But while thousands of fans watched them on their TV screens, the girls were seeing in the New Year in their own way.

Under the picture that Nicola posted of her and friend Kimberley, she wrote: 'Best friends for New Year.'

And Cheryl Cole was obviously in a reflective mood, as she tweeted a message to her fans:

New start: Both Cheryl Cole and Sarah Harding tweeted about their good wishes for 2013

Seeing in the new year: While their fans watched them perform on BBC, the girls were celebrating in their own ways

In sync: The girls performed the track in unison to round off their ten year anniversary year

'I just want to say a massive Thank you so much for all of your support and love over the past year. 2012 has been a good one but roll on 2013 !!'

Nadine Coyle also posted a heartfelt New Year's Eve message after the Girls Aloud performance was aired:

New year message: Cheryl Cole posted a message to her followers to mark the beginning of 2013

Positive: Sarah posts an uplifting new year message

'Sending massive love and best wishes to all of you for this new year! Don't do anything I wouldn't, meaning i encourage you to do it all! Xx,' she wrote.

And, not to be outdone, Sarah Harding posted an uplifting message from all the way from her romantic break in Thailand.

'Not long left til 2013!!! Looking forward to a fresh start!!,' she wrote.