Robert Pattinson worries about his appearance.

The 'Twilight' hunk admits he never used to care whether he looked presentable until becoming an A-list star, but now he stresses out about his appearance and clothes in public - and has even started worrying about getting wrinkles.

Quizzed on whether he thinks he's good looking, Rob said: ''It depends, sometimes. But I'm weird about my looks. Once you get photographed a lot it changes you. I remember when I first did 'Twilight' I didn't care about how I looked - there was less pressure, I guess. I was like, 'I'm cool as s**t!'

''[Now] every time I appear somewhere, I think, 'I don't know how many more times I can do this.' Dressing up to go somewhere and be looked at - I get so nervous. Up until the second I have to leave, I'll get changed a million times. It's crazy. Literally, just before I go, I look in the mirror and think, 'You look like s**t.' I start worrying about wrinkles.''

The 27-year-old star's ritual of self-scrutiny has become part of his routine before attending showbiz events, but he admits it can be tough on those around him.

He added to InStyle magazine: ''Honestly, everyone who works with me knows they'll have to sit there and wait for me to go through my process of having my panic attack about how I look.''