The Irish singers were the latest boy band members to team up with Caroline while her 'telly husband' Olly tours with One Direction in the US.
Caroline has already had JLS stop by at the London auditions and had to put up with Jedward at the Manchester try outs earlier this month.
Tweeting backstage at this week's auditions at Newcastle with new judge [tag]Nicole Scherzinger[/tag], the telly host said: "Nicole is a dream to chat to and I'm being joined by the Westlife boys"
Olly will rejoin Caroline on the ITV2 spin-off in time for the live shows, and she can't wait to have him back!
Speaking to the Sunday Mirror at the weekend, Cazza revealed she was keeping Olly up to date with all the latest gossip from the [cat c="the x factor"]X Factor auditions[/cat].
Caroline told the tabloid: “I do miss Olly Murs not being there at the moment but I keep messaging him as he doesn’t want to be left out.”
The X Factor 2012 airs on ITV1 this autumn.