Jonathan Rhys Meyers is set to become a father for the first time.

The 'Dracula' star is expecting a baby with his partner Mara Lane and, although they're remaining tight-lipped its due date, it's believed the little one is expected to make an appearance over the festive season.

Taking to her Instagram account on Monday (12.12.16), the Irish actress uploaded a photograph of her burgeoning bump while standing opposite a man dressed in the traditional Santa Claus attire.

She accompanied the picture with the caption: ''#IncomingPackage best present. #ThankYouLord #SantaBelly (sic)''

And it seemed once the brunette beauty had shared her swollen stomach with the world, she couldn't stop as she announced that she has spent almost every day in the same second-hand stretchy frock.

She said: ''My official pregnancy dress. I have worn this 1-2x a week every week for past 5 months. It was 3 euros in a charity shop in Ireland I love #recycled clothes. #Recycledclothes #antislavery #recycledclothing over fast fashion any day for me T on the other hand ... #megaprincess owns collars and leashes more than I am embarrassed to say #fathersdogter (sic).''

And, although her baby is yet to make its entry into the world, it seems the little one is already dictating as she hasn't been able to eat meat.

She added: ''Has not let me eat much meat entire pregnancy either ... has me thinking about things I'd rather live in ignorance to. #speciesism waat just stap angel alien baby about to rock my world I already know #thankful for my soon to be best teacher and friend (sic)''

Mara began dating Jonathan in early 2013 and reportedly got engaged in 2014, although neither of them have confirmed it.

It was thought they'd tied the knot on the sly in September after the 39-year-old hunk was spotted wearing a gold band on his ring finger.

It seems Jonathan is finally getting his life back on track following years of battling with alcohol addiction and even went to rehab.