Robert Pattinson called himself 'Big Tub' when he styled himself as a rapper.

The 'Twilight' star previously admitted to wanting to be a rapper when he was a teenager and has now elaborated on his musical ambitions by confessing he even picked out an alter-ego which was inspired by his weight.

Quizzed about his ambition to be a rapper on 'Late Night with Seth Meyers' on Tuesday (17.06.14), he said: ''Oh yeah, 100 per cent. I still kind of do. I was 'Big Tub', that was my rap name. I was very paranoid about my weight.''

The 28-year-old actor took his teenage hobby a step further by recording some of his early raps with his bandmates, the Tabby Cats.

He explained: ''I didn't know how to scratch [a record] so I used to pull up and down the zip on my hoodie and record it. It sounds exactly like it! [We were] Big Tub and the Tabby Cats.''

While Pattinson has abandoned his hopes of a rap career in favour of acting, he still retains Big Tub's concerns about his body and maintaining a slender physique.

He added: ''I got quite sick in the last couple of days and I'm so excited about it. Next week I'm going to be so skinny!''

'The Rover' star's passion for music is well known and he's previously claimed it would be his ''back-up plan'' if his acting career stalled.

As well as being a keen guitar player, Pattinson has recorded songs for the soundtracks of his films, including 'Twilight' and 'How to Be'.