Girl group set to return... Cheryl Cole has posted a picture of a mini Girls Aloud reunion on Twitter. The image shows four of the girl group's members – Cole, Sarah Harding, Nicola Roberts and Kimberley Walsh – posing in a mirror with their camera phones. The only member of the five-piece absent is Nadine Coyle, who is in America. On Twitter, Cole kept details about their meet-up secret, and only wrote the message: “Love my girlies", while the photo had the title: "Girls night in...”. Sarah Harding on the catwalk at London Fashon Week over the weekend. It comes after Harding confirms at London Fashion Week the long-standing rumours that Girls Aloud are set to reunite in 2012 to mark their 10th anniversary. “We don’t know exactly what we’ll do yet, that’s what we’re trying to figure out,” she told the Daily Mirror . “We’ll do what we’re good at, and hopefully get some more No1s!” Harding added: “We reminisce a lot when we’re together – we talk about being on tour. I