Gwen Stefani and husband Gavin Rossdale
Gwen Stefani and the Bush frontman are said to be excited about their new arrival.

Gwen Stefani is reportedly expecting her third child with husband Gavin Rossdale.

According to In Touch magazine, the No Doubt singer and the Bush frontman "couldn't be happier".

"She's just trying to focus on resting right now. She wants to make sure that all is well with the baby," a source told the publication.

The 43-year old singer, famous for flaunting her washboard stomach in tiny crop tops, has been seen in looser-fitting outfits in recent weeks.

Stefani and Rossdale have two sons - Kingston, seven, and five-year old Zuma.

The new arrival would be a welcome addition for the couple who have gone on the record as saying they want more kids.

In September 2012, the singer revealed that she and Rossdale tried for a third child in 2010 but it never worked out.

She told the mag: "I really wanted one about two years ago. And it didn't really work out. So I feel good with what we've got.

"Everything works out how it should. You can't plan anything, right? You can try."