Jason Bourne star Julia Stiles has married her fiancé Preston J Cook, with the mother-to-be joking on social media: "Who doesn't love a shotgun wedding?"

Stiles, who played Nicky Parsons in the Bourne movies, shared the news on Instagram on Tuesday, posting a picture of herself in a white lace dress with her husband's hand on her stomach. 

The picture had the caption: "Who doesn't love a shotgun wedding?" with a winking face Emoji.

Photo copyright: Julia Stiles, Instagram

A representative for the star told E! News that Stiles and Cook had married in Seattle, Washington during the Labor Day holiday weekend in the US earlier this month. 

The couple's first child is due in October.

Julia Stiles opposite Matt Damon in 2016 spy sequel Jason Bourne

Stiles and Cook met on the set of Blackway (aka Go With Me). He was working as a camera assistant on the thriller.

They became engaged on Christmas Eve 2015.

Stiles was most recently seen on screens in the Sky Atlantic thriller series Riviera.

Julia Stiles in Riviera.