Blake Lively and Ryan Reynolds make surprise pregnancy announcement

Actress Blake Lively debuted her growing baby bump alongside husband Ryan Reynolds at the Pokemon Detective Pikachu premiere.

The 31-year-old revealed the surprising news that she is pregnant with her third child, while supporting Ryan at the New York premier of his latest film on Thursday.

The mother-of-two stunned fans when she arrived, alongside Ryan, at the premier wearing a Retrofête yellow beaded gown that revealed the blossoming baby bump.

The Gossip Girl star posed for photographs, with 42-year-old husband Ryan, cradling her bump.

The Pokémon Detective Pikachu Twitter account were quick to confirm the exciting news.

They posted pictures of the stunning actors, with the caption: ‘Congrats to our very own #PokeMom, @blakelively! So happy for you & @vancityreynolds. 💛⚡️.’

Fans quickly turned to social media to congratulate the pair.

One said: ‘OMG! Congratulations!’

Another added: ‘I’m sooooo happpy for them.. 🥳.’

Others joked the couple were soon to have their very own baby Pokémon.

One said: ‘Baby Pikachu coming soon💗💗Congratulations🎉🎊.’

Another added: ‘#PokeMom #pokemom ILOVEYOU!’

The gorgeous couple tied the knot back in 2012.

They are parents to two adorable daughters Inez, two, and James, four.

Blake has previously spoken of the struggles of parenting admitting: ‘It’s like every moment you’re figuring out what the heck you’re doing. You think, ‘Ooh, should I be more strict, or should I be more I don’t know, emotional?’’

She went on to say: ‘If anybody knows how to be a parent, I feel like grandparents really know how to be parents. But parents, you just figure it out as you go. So, I wouldn’t put a label on it.’

Read more: Blake Lively reveals why the word ‘bossy’ is banned in her house

Ryan recently revealed to PEOPLE magazine the importance of keeping their family together.

He said: ‘Blake and I don’t do movies at the same time. If she is doing a movie in Thailand and I am doing a movie in Vancouver we would just never see each other. We operate as a unit, and that works really well for us.’

The Reynolds’ household is soon to become a family of five!