Kevin Mazur/WireImage

Work it, Mama!

Kate Hudson attended the Grammy Awards on Sunday night to support boyfriend-rocker Matt Bellamy with her baby-bump on proud display in a second-skin Roberto Cavalli dress with side cutouts.

Our friends at PopEater report that 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 for Best Rock Album, the Muse 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.

News of Hudson's surprise pregnancy broke last month. Engagement rumors began making the rounds shortly after, though the actress was quick to deny them.

"I don't like putting that sort of pressure on it," she told 'The Graham Norton Show' about her relationship with Bellamy. "I don't feel it necessary to get married ... I am 31, I already have one child and one divorce, so it is not necessarily the golden ticket. I just want to be happy."

The couple's new arrival later this year will join Hudson's son Ryder, 7, with ex-husband Chris Robinson, singer for The Black Crowes.

Meanwhile, check out Bravo star Rosie Pope's red carpet style tips for pregnant celebrities.