Katherine Heigl can't hide pregnancy on the set of new TV drama

Actress Katherine Heigl is struggling to hide her baby bump while filming new legal drama Doubt.

The Knocked Up star is knocked up for real after confirming reports she's expecting her third child earlier this summer (16), and she admits finding ways to disguise the fact she's pregnant while shooting her new TV series has started to become very difficult.

"We're working really hard to try to hide it, and it's a challenge, because every day my body changes a little bit more," she tells InStyle magazine.

"We started out with really high hopes of, like, fitted, pencil skirts, and those really great Victoria Beckham dresses, and that became impossible pretty quickly.

"So now it's a lot of big coats. It's either a purse, a jacket (to cover the baby bump). I think I should start carrying a big plant around, honestly - just to shake things up."

But Katherine is more than happy to show off her full figure when she's not working on set - last week (ends12Aug16) she posted a shot of herself and husband Josh Kelley at a Hollywood party on Instagram.

Looking stunning in a form-fitting white dress, she wrote: "Had the most wonderful day talking about my new show @doubtcbs. Can't wait for you all to see it! Thank you to my amazing man @joshbkelley for coming with me and showering me with love and support!"

The baby will be the couple's first biological child - Heigl and Kelly are already parents to two adopted daughters, Naleigh, seven, and Adelaide, four. She recently revealed the pair is expecting a boy.