OUTLANDER fans are thrilled after previously unseen photos of actor Caitriona Balfe during her pregnancy have been shared online.

The Irish star revealed two weeks ago that she had secretly given birth to her first son shortly after filming for the TV show's sixth season wrapped.

Castmate Cesar Domboy has taken to Instagram to post snaps of then-pregnant Caitriona, who plays Claire Fraser in the hit series, on set during filming.

The 41-year-old can be seen sitting on a swing, with her baby bump carefully hidden by 18th century clothing.

Cesar captioned the photo: "Queen @caitrionabalfe being like (sun emoji)! fav shot from last season’s shooting. We’ll be back soon guys."

The actor replied to the photo, saying: "Awwww miss you Cesar ..... (heart emoji)."

Hundreds of happy fans replied to the pair, with one commenting: "you look so happy and radiant."

Another fan said: "it's so good to see you so happy.

"we're dying to see some pictures of you with baby bump."

While a third added: "Wonderful happy carefree moment. Can't wait to see your work in season six."

When Caitriona announced to the world that she was pregnant, she apologised to fans for taking time away from social media and revealed that it was because she was "cooking up a little human".

The star wrote: ""I’ve been off socials for a while as I was taking some time to enjoy cooking up this little human. We are so grateful for this little soul... that he chose us as his parents.

"I’m in awe of him already and can’t help stare and wonder at all the possibilities of who he will become, where he will go and what he’ll do on the big adventure of his life."