Louis jokes about Simon's shoes
Louis Walsh has poked fun at Simon Cowell for wearing stacked heels.
The Irish judge was whisked to the US at the last minute to stand in for his X Factor boss at the Kansas leg of the US X Factor auditions, after Simon fell ill with bronchitis.
Louis joked: "I'm stepping into Simon's shoes... but my shoes are flat," The Sun reported.
Fellow judge LA Reid also had a pop at Simon, with the music producer saying: "The good news is we're having a great time. The bad news is that we're having a great time."
Louis has formed an unlikely friendship with judge Britney Spears, saying of the Toxic singer: "Britney and I are bonding," while the US singer tweeted: "We'll miss you Louis! See you soon."
Meanwhile Reid said of his relationship with Britney: "We get along good..." before looking at Louis and joking: "Him, not so much."