The 15 year old was nominated for an Academy Award for her role in 2007's Atonement and she went on to land a role in Peter Jackson's latest film The Lovely Bones, opposite Mark Wahlberg and Rachel Weisz.

Ronan is convinced it's hard for young stars to stay grounded amid all the pressures of fame, but she's determined to steer clear of trouble and keep her name out of the gossip columns.

She tells the Los Angeles Times, "I don't think I would ever want fame like them (other child stars). I have to say, I think Miley Cyrus is still quite young. She's what? Seventeen? I think she's very brave for all that fame to be thrown at her so young. She's like another Britney Spears. I don't envy her at all - or any of those girls who get that much attention.

"I suppose we're different kinds of actors. I focus on my work. The stuff that comes afterward - the press and premieres - it's fine, it's fun... but what I really want to do is work on my acting."