Robbie Williams thinks his penis is ''quite small''.

The 41-year-old singer - who has Theodora, three, and 11-month-old Charlton with his actress wife Ayda Field - has admitted that the size of his member is the only thing stopping him from becoming a naturist.

He told The Sun on Sunday newspaper: ''I've always said to past girlfriends, 'It's not a small c**k, I've got massive thighs and it's an optical illusion'. It's not though, it really is quite small!

''So if I had an extra inch and a half, I'd be a naturist. But I haven't, so I'm not.''

Meanwhile, the 'Angels' hitmaker revealed recently that he's preparing to make the move into TV, although he remained tight-lipped about what his next career move would entail.

He explained: ''I've got a few irons in the fire that aren't necessarily musical. Nothing solid yet but it would involve TV.

''Yeah, acting. I shouldn't have said anything because I can't say anything.''

However, Robbie was happy to reveal he intends to create and star in his own show.

He shared: ''I've got an idea for a TV show that I want to do. It may or may not happen - and at the moment it is happening and I'm excited about it.''