Zoe Saldana wants teenage boys to fancy her in 'Guardians of the Galaxy'.

The 'Colombiana' actress stars as alien beauty Gamora in the upcoming sci-fi-adventure and she's confessed one of her main worries during production was making herself look attractive in her costume and make-up.

Quizzed on whether her character's image had been decided before she joined the project, Saldana explained: ''No, I think we had maybe seven or eight camera tests we had to do, when it came to all the characters and for mine specifically it was, 'How alien do we want Gamora to look like?' And what I was thinking was, 'She just needs to be pretty' ... For some reason because I was going to be green and I was going to be the lead girl, I just wanted teenage boys to find me attractive.''

The 36-year-old star - who appears alongside Chris Pratt, Karen Gillan, Vin Diesel and Bradley Cooper in the movie, which sees adventurer Peter Quill (Pratt) as the object of a bounty hunt after stealing a mysterious orb - blames her age for her worries about getting the right look for Gamora.

She told ScreenRant: ''Maybe because I'm older and you kind of go, 'Am I losing my sex appeal or something?' When you're green for four months, it definitely moves you a bit and you do kind of wobble going, 'Okay, what is beautiful?'

''And then you start to find your character really appealing and very beautiful in how different she looks and you get used to it.''

'Guardians of the Galaxy' is scheduled for worldwide release on August 1.