Bill Nighy
The 'Love Actually' star is renowned for his sartorial elegance but was left looking far from smart in one audition.
Nighy recalled: "There was one that started out terrible, which was where I had to go to a disused tax office in Harrow [near London, England] very early in the morning and put on very tight velvet flared loon pants and a pair of crocodile four-inch- heeled platform shoes, and wear a sort of very small top that didn't meet my trousers, hair extensions and I had to karaoke to 'Smoke on the Water' by Deep Purple. It's a very lonely place. And I was 45 at the time..."