Robbie Williams has admitted that he's too scared to ask Adele to collaborate with him.

The singer has long been linked to working with the '21' star and it had been mooted that she could appear on his forthcoming new swing album.

However, despite being good friends with Adele's boyfriend Simon Konecki, it seems Williams is too bashful to ask for a duet. He told RTE:

"She and my wife, Ayda, are really good friends and I'm really good friends with Simon [Konecki], her boyfriend. We're good pals, but I wouldn't ask Adele to sing on my record. The whole world wants Adele to sing on their record. I think we'll just leave it as a nice friendship, so that story about a duet is totally made up."

The 'Candy' star, however, added: "I can tell you that Mr Michael Bublé is on the album. Me and Michael on the same record, I'm so excited! We're going to record a song I've written and graciously, he thinks it's a good tune too and wants to be on it...I am a big fangirl of him."