Hip hop guru Pharrell Williams delighted guests at Kate Moss's 30th birthday party on Friday night (16JAN04) - by performing a spontaneous rap with fashion designer Stella Mccartney.

The unlikely collaborators joined forces at the glitzy bash and treated 20 onlookers to a beat box version of The Kinks classic YOU REALLY GOT ME.

And Stella - who has previously said she would launch a music career if her fashion business faltered - joked that they would release the track as soon as possible.

A source says, "They soon had the attention of 20 guests, who all started clapping when they finished. Stella thanked them and joked: 'It'll be out in shops soon.'"

20/01/2004 01:48