There's a Baby Rose Byrne on the way.

Mum’s the word. Literally.

Popular Australian actress Rose Byrne is reportedly expecting her first child with partner Bobby Cannavale. Whilst the Bridesmaids star is keeping mum on the rumours, People and Us Weekly have both confirmed that the pair are expecting their first child together.

Byrne was photographed leaving the airport in her adopted town of Los Angeles earlier this week and was reportedly sporting a noticeable baby bump, sending gossip mags into a frenzy.

Although neither Byrne nor Cannavale have confirmed the pregnancy, Entertainment Tonight cited an undoubtedly reliable “source close to Rose” when discussing the rumour.

It is believed that Byrne and Cannavale began dating in 2012, although the relationship wasn’t confirmed until the following year, when Cannavale called Byrne “the love of my life” after winning the Outstanding Supporting Actor in a Drama Series award for his role on Boardwalk Empire at the 2013 Emmys.

Wondering where you recognise Cannavale from? The actor – who also has a Tony award to his name – has guest starred on all your favourite TV shows, including Will and Grace, Sex and The City, Ally McBeal and Law and Order: SVU.

[Ed note: A canny reader pointed out that we sold Cannavale short in this description. He was a supporting actor in Ant Man, where he played the grossly under-rated role of Paxton. Judy Greer was also a supporting cast member in that film, so it had a bevy of remarkable supporting actors. Thank you, Shannon (And Mr Cannavale)]

While this as-yet-unconfirmed foetus will be Byrne’s first child, Cannavale is already a father to 20-year-old Jake, his son with first wife Jenny Lumet.

Click through for more of Byrne and Cannavale showing their suitability for being DNA donors...