Kate Moss and pal Beth Ditto impressed Simon Cowell with impromptu duet

Kate Moss and pal Beth Ditto impressed music boss Simon Cowell by performing an impromptu duet, it has been claimed.

Kate, 35, attended the launch of Beth’s plus-size clothing range for Evans at London club Sketch.

The pals then got up and performed a duet on karaoke game Singstar in the area’s VIP section.

An onlooker said: “Kate and Beth spotted Singstar, grabbed the mics and sung Space Oddity by David Bowie. They were both really going for it.

“The funniest thing was at the end of the song when it flashed up on the screen who had hit more of the right notes, it turned out Kate had done better than Beth!

“Everyone was clapping and cheering her and she was loving it.”

X Factor judge Simon Cowell, 49, and Topshop and Evans boss Sir Philip Green, 57, were watching the performance from the back of the room.

The source added: “Simon and Sir Philip were entranced by Beth and Kate singing and couldn’t stop smiling and laughing to themselves.

“Afterwards, Kate went over to speak to them and Simon congratulated her on her performance.”