PICS: Rose Byrne is preggers

Los Angeles - Rose Byrne is reportedly pregnant.

The 36-year-old actress has sparked rumours she's expecting her first child with her longtime actor boyfriend Bobby Cannavale, 45, after she stepped out in Los Angeles sporting what appeared to be a baby bump underneath her loose-fitted plaid shift dress, according to UsMagazine.

And it seems the couple, who have been dating for three years after they met on the set of Annie reboot in 2012, are getting ready for their new family as they snapped up a three-bedroom house in Brooklyn, New York for an estimated $2.2 million earlier this month.

Meanwhile, the Bridesmaids actress has nothing but kind words about her beau and recently admitted she feels incredibly "lucky" to share her life with him.

She said: "He's this very kind-hearted, wonderful guy. I'm very lucky to have met him."

The pair star together in both Spy and Adult Beginners and Rose has revealed she was initially "nervous" of working with her boyfriend but is happy the risk has paid off.

She explained: "We're getting to work together a lot lately. I was initially nervous - clearly, it could have not been a good idea - but it's fun to have someone close to you on set rather than spending months apart."

Meanwhile, prior to dating Bobby, Rose dated fellow Australian actor Brendan Cowell for six years until they split in early 2010.

(Photos:Greatstock/Splash)