Kate HudsonKate Hudson showed up to the Grammys Sunday night to support boyfriend-rocker Matt Bellamy, and she wasn't shy about showing off her growing belly, according to Us Magazine.

Hudson attended the star-studded event with beau Bellamy, whose band, Muse, performed and later won Best Rock Album. The couple are expecting their first child together later this year.

The duo, who have been quite private regarding their relationship, were uncharacteristically affectionate as they cuddled in their seats before the show began, and Hudson even posed for photos to show off her baby bump. She also caught up with friend Nicole Kidman, who was with her country crooner husband Keith Urban.

When it was time for Bellamy to take the stage to accept his band's award, the singer gave a shout out to his baby mama-to-be.

"I'd like to give a special thanks to my beautiful pregnant girlfriend over there," he said during his acceptance speech, careful not to mention her by name.