Alexa Chung won't pose topless because she doesn't have "big tits".
The British TV presenter is reluctant to bare all for men's magazines because she doesn't possess ample bosoms, and fears it would harm her future career prospects.
Alexa, who was a model for six years from the age of 16, said: "I think I made it quite clear that taking my clothes off for magazines was not the route I wanted to go down. Firstly because I don't feel comfortable doing that, and secondly I don't have big tits.
"I also think it gives you a certain shelf-life. I want to be on Radio 4 when I'm older talking about books, and I think if I get my tits out now I won't be able to do that later."
The 'Vanity Lair' star admits she is wary of becoming over-exposed.
She said: "I don't want to shove my face down everyone's throat. I get bored with reading celebrity magazines and seeing the same faces around. I don't want to be seen as famous for going out."