After the mega mouth experience of Geri Halliwell last week, this second instalment sees guest judge Natalie Imbruglia help Simon Cowell, Cheryl Cole and Louis Walsh select the best solo singers and groups as the auditions move to Birmingham. A little birdie has also told us they'll be paying Dublin a visit tonight, although it's not mentioned anywhere in the press release... which leads us to believe that said wee birdie is lying through its beak. Surely they'd make a large fanfare over Katy Perry wheeling herself out for the proceedings? Dermot O'Leary calms the contestants' nerves backstage, with many hugs and a concerned cocked head, as they prepare to face the panel and an audience of more than 3,000. Only the most impressive acts will be invited to Wembley Arena (yep, Wembley) in a few weeks' time to battle it out in boot camp. The Xtra Factor follows on TV3 and ITV2.