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Kate Hudson and Matt Bellamy have become engaged, according to reports.

The couple, who recently announced that they are expecting a baby together, reportedly held a family party in a London hotel to celebrate the news.

The Bride Wars actress and the Muse frontman flew in from Los Angeles for the private bash, according to The Sun.

A source said: "It was an intimate party. They kept their engagement secret as they wanted to celebrate with their nearest and dearest before it became public knowledge."

Earlier this week, Hudson's mother Goldie Hawn and stepfather Kurt Russell expressed their excitement about the actress's pregnancy.