Los Angeles: Dwayne 'The Rock' Johnson's girlfriend Lauren Hashian, who is expecting her first child with the actor, is worried about having a '20lb baby'.

Dwayne Johnson
Dwayne Johnson. Pic/Santa Banta

Johnson and Hashian will welcome a daughter next year and she is hoping her well-built partner's genes won't be passed down to the little girl, reports femalefirst.co.uk.

She wrote on Instagram alongside a photograph of herself and Johnson: "And like big daddy says - couldn't be prouder of all the kicka** women she's going to have around her! And men of course #LetsJustHopeBigDaddyDoesnt = 20lbBaby."[sic]

The singer has been fairly quiet on social media since announcing her pregnancy, but is enjoying every minute.

"I know I'm late to the party... Sometimes life gets full and busy in the best ways. So grateful and in awe of this time. To experience creating a little life is just incredible. This beautiful cycle of life and womanhood beginning again," she added.