Kate Hudson and Muse frontman Matthew Bellamy have called off their engagement, People magazine reports. "Kate and Matt have been separated for some time now," Hudson's rep told People. "Despite this, they remain very close friends and committed co-parents." The couple, who had a four-year relationship, have a son, Bingham Hawn Bellamy, who was born in July 2011. Bellamy and Hudson became engaged in April 2011. Hudson was previously married to Black Crowes leader Chris Robinson. The pair, who split in November 2006 after marrying in December 2000, have a son, Ryder, 10.