The presenter, 28, was rumoured to be dating the One Direction hunk, 20, last year after they appeared to be leaving the same building the morning after a night out, but she's confessed she was never romantically involved with him because he's far too young for her.
She told heat magazine: ''I was never seeing Niall. He's a child. The most embarrassing thing about that is that people thought we were together.
''I love Niall, he's lovely. But I'm 28. He's a boy. And he kind of looks like my little brother. So, no.''
Laura - who is reportedly dating 'Scream (Funk Up My Life)' hitmaker Paolo Nutini - has been signed up to present the Eurovision song contest's semi final with BBC Radio 1 presenter Scott Mills.
She is also reportedly taking over from Caroline Flack as the host of 'The Xtra Factor', but she claims she hasn't been offered the job.
She explained: ''My mother actually called me up and was like, 'You didn't tell me you were doing 'The Xtra Factor'!' But listen, I've been in LA for a week, so I have no idea what's going on.''
The ‘Iron Man’ star will play the doctor who can talk to the animals.
The show will return to CBS for seasons 11 and 12.
30 year old Mvula said Sony only told her she was being dropped in a 'seven-line' e-mail.
From Bono to Michael Fassbender, here are some of Ireland's best loved celebrities on St. Patrick's Day.