Speaking to Digital Spy, the presenter debunked "nonsense" reports that he had quit ITV2's Britain's Got Talent companion show and said that a deal to front its seventh series is already "done".
Mulhern, who is preparing to star in Woking's Dick Whittington pantomime later this year, clarified: "There was this rumour that I was quitting, but I'm not. In fact we finish the panto on the sixth of January and we start auditioning again [for Britain's Got Talent] on the seventh."
Asked if he ever worries about being axed from More Talent by Simon Cowell, Mulhern pointed out that attempts to mix up the presenters on other spinoff shows has resulted in a few "faux pas".
"Any spinoff show like Xtra Factor or Big Brother's Bit on the Side, they seem to change their presenters," he noted.
"If you go to Xtra Factor you've gone from Ben Shephard, to Holly Willoughby, to Fearne Cotton to now Caroline Flack and Olly [Murs] and you go, 'Yeah, that was a bit of a faux pas wasn't it?' That's showbiz.
"I'm over the moon [to be back] and it's just lovely. We've got a real nice family atmosphere [on the show] and, yeah, it's exciting."
Cowell has publicly invited fellow judges David Walliams, Alesha Dixon and Amanda Holden to rejoin him on the Britain's Got Talent panel in 2013.