Grant mocks Roberts' 'big mouth'

British actor Hugh Grant prompted Oprah Winfrey to jump to her pal Julia Roberts' defence on Friday, after he mocked the Oscar- winning actress' "big mouth".

Grant appeared on Winfrey's chat show to promote his upcoming movie Bridget Jones: The Edge of Reason alongside Renee Zellweger and Colin Firth, when he was asked to share his thoughts on his Notting Hill co-star, Roberts.