As party ideas go, George Clooney and Julia Roberts' one is quite expensive.

The Hollywood stars are reportedly planning on hosting a celebrity bash with Giorgio Armani at New York's Metropolitan Museum of Art Costume Institute in May, according to the Mirror.

And Grammy winner Winehouse has been earmarked as the entertainment, although Clooney and Roberts will have to dish out £500,000 for her services.

"Giorgio has made no secret to his friends that he would love to work with Amy. He sees this party as an ideal opportunity to sound her out about future projects together," a source told the newspaper.

In September 2007, Winehouse was beaten to the Nationwide Mercury Prize for best album by Klaxons.

Despite not picking up the prize many had predicted she would win, her striking performance at the show received a lot of attention on the night and in the following day's press.