Watch Louis Walsh on The X Factor USA... and some VERY bad acting from Britney!

Louis Walsh

Louis Walsh made his guest appearance on The X Factor USA over in the States last night, having flown in to replace an ill Simon Cowell.

And in this promo clip of Louis arriving on set, it seems that the Irish music mogul has got plenty of introducing to do!

In a backstage skit, X Factor USA judges LA Reid, Demi Lovato and Britney Spears are seen wondering just who he is.

But once Louis meets the trio it seems that Simon's days on the show could be numbered.

Britney quips: "Maybe we won't Simon back!"

The X Factor USA will air here in the UK on ITV2 from September 27.

Meanwhile the latest ratings from America show that The X Factor USA is suffering a similar ratings decline to its UK counterpart.

The latest series, which has seen two new judges, is down on last year's opening run already and is also losing out to reality telly rival The Voice.

Despite replacing Nicole Scherzinger (who replaced Cheryl Cole) with Britney Spears, last night's latest auditions failed to attract US viewers.

In fact, fewer watched the US show than the latest UK instalment, which was watched by over 11 million viewers at the weekend.

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