Olivia Wilde says Chris Hemsworth is one of her favourite leading men.

The 29-year-old actress has admitted the 'Snow White and the Huntsman' star is among her most loved actors and she described him as ''professional''.

Speaking at the 'Rush' world premiere in London's Leicester Square tonight (02.09.13), Olivia described her co-star as ''so professional''.

Asked whether she considers him one of her favourites, the actress told BANG Showbiz: ''Oh, absolutely. Yup ... definitely ... Amazing. He's so professional, he's so amazing, and he's so sweet. You can't ask for anything more.''

Chris, 30, stars as Formula 1 star James Hunt in the new biopic, and he admitted they both suffered similar problems, with his large frame making it difficult for him to fit in the ''tight'' race cars

He said: ''It was [a bit risky] and it was a tight squeeze, too. I think James was 6-foot-2, which is a similar size to what I was in the film, so he had the same problem getting into these things.

''But you instantly understand the addiction this guy had with his work; there's an immense amount of power at your fingertips, you feel every bump and vibration of the car ... I think that's every young boy's dream.''

Chris and Olivia were joined at the premiere by co-stars Daniel Bruhl and Alexandra Maria Lara, and director Ron Howard

Other attendees included the likes of David Hasselhoff, Warwick Davis, Naomi Campbell, Jenson Button, David Coulthard and Niki Lauda, James Hunt's real-life racing rival.