A romance is brewing between Kate Hudson and Gerard Butler after the pair partied together at last week's Golden Globe Awards - according to U.S. tabloid reports.

Sources claim Butler - who has been linked to Jennifer Aniston and Lindsay Lohan - set his sights on single Hudson, and wouldn't leave the pre-ceremony bash until he had secured her number.

An onlooker tells Us Weekly magazine, "Gerard told Kate she was the most beautiful girl in the room and that he adores her work.

"He was really locked in on her."

Hudson has been single since splitting with baseball star Alex Rodriguez late last year.