Dwayne 'The Rock' Johnson and partner expecting second child

Dwayne 'The Rock' Johnson and girlfriend Lauren Hashian have announced they're expecting their second child together.

The 45-year-old Fast and Furious star says the couple is "boundlessly grateful" to be pregnant with another girl.

Johnson took to Instagram to share the happy news with a photo of their first daughter, Jasmine.

"Our Jasmine Lia would like to make a big announcement - IT'S A GIRL," Johnson wrote.

"[Girlfriend Lauren Hashian] and I are boundlessly grateful for this blessing as this spring we'll welcome our second baby. [We] are boundlessly grateful for this blessing as this spring we'll welcome our second baby."

Johnson is also father to 16-year-old girl Simone with ex-wife Dany Garcia.

"Big daddy is completely surrounded by beautiful oestrogen and loving, powerful female mana," said Johnson.

"All girls. Only dude. I wouldn't have it any other way."

Johnson and Hashian have been together for 10 years, and welcomed Jasmine in December, 2015.

Newshub.