Kate Hudson is 14 weeks pregnant with rocker boyfriend Matthew Bellamy's baby. "It was not planned, but they are excited and embracing it," a source tells Us Weekly.

Hudson, 31, already has a 7-year-old son Ryder with ex-husband, Black Crowes frontman Chris Robinson, 44. Bellemy, 32, is the lead singer of alternative rock band Muse and has been dating Hudson for nine months.

The source tells Us: "She is happy for Ryder to finally have a brother or sister."