Frank Sinatra, Dean Martin, Sammy Davis Jr, Joey Bishop and Peter Lawford were the names on the lips of American Idol’s final five contestants as they performed on this week’s Rat Pack-themed show – with actor and singer Jamie Foxx as this week’s celebrity mentor.

Kris Allen was first to perform, singing The Way You Look Tonight, impressing Randy Jackson, who called it his best performance to date whilst Kara DioGaurdi and Paula Abdul swooned, with Abdul telling him that he had turned from gone from the “adorable boy next door to the ever-so-handsome sophisticated gentleman.” Simon Cowell took a different view, however, calling his performance “a little bit wet” and “not that incredible”. Allen is now a top choice to reach the final, after it was revealed he was the surprise second most downloaded artist on iTunes, from this year’s line-up, behind Adam Lambert, with Danny Gokey widely thought to be Lambert’s nearest competitor.

17 year-old Allison Iraheta was next up, singing Someone To Watch Over Me, with the judges praising her efforts – apart from Cowell again, who told her that he doesn’t think she believes she can win and that “she might be in trouble tonight”. Iraheta was followed by Matt Giraud, who was the third performer singing My Funny Valentine, which Jackson and DioGuardi didn’t believe came off for him before Cowell once again disagreed with his co-judges telling him “it was the only believable and authentic performance of the night”.

Danny Gokey sang next, singing Come Rain Or Shine – with Cowell telling him his vocals were “outstanding” and that he “loved his swagger”. DioGuardi agreed, and Jackson believed he could “release an album like this and win”.

Adam Lambert was the final contestant to sing – which once again earned rave reviews from the judges. Abdul compared his show stopping performances to “watching Michael Phelps in the Olympics”, and says he makes her “feel better than good”, while DioGuardi says he’s “shocking in a good way… confusing and shocking and sleazy and superb and way over-the-top.” Jackson labelled the performance “too Broadway and dramatic” before Cowell retorted, “complaining about that for any Adam effort is like complaining that cows moo.” Cowell added that he “can tell that Adam wants to win and entertain every week.”

Watch American Idol, Thursday 30 April, 8pm, ITV2