Kate Hudson has already married rocker Matt Bellamy, according to her mother Goldie Hawn.

The Overboard actress - who raised Kate with actor Kurt Russell - has hinted Kate and Matt, who have seven-month-old son Bingham together and have been engaged since April 2011, may have wed in secret.

"My kids are fantastic with their children, they have an amazing parental ethic and I'm very proud of them for that. When my daughter Kate married an English rock star [Matt Bellamy] it didn't worry me; all that matters that the relationship is a good one. What people do is not necessarily who they are. Kate hasn't picked up too many English mannerisms, she's held on to her identity quite well," she said.

Speaking last year, Something Borrowed beauty Kate said she and Matt - who began dating in 2010 - were in no rush to wed. "One thing at a time. We'll say hello to our new one and enjoy that for a while," she said at the time.