Robin Thicke and April Love Geary are having a girl.

The 'Blurred Lines' hitmaker and his 23-year-old model girlfriend - who already have six-month-old daughter Mia together - held a gender reveal dinner at celebrity hotspot Catch in Los Angeles on Saturday night (25.08.18).

April took to her Instagram Story to share several clips of the party, including one of them cutting a chocolate cake open and pink liquid pouring out of it, signalling they are expecting a second daughter.

The brunette beauty also added a picture of her kissing the singer, and captioned it: ''Going to have another daddy's girl!!! I love you baby! thank you @markbirnbaum for doing the best sex reveal ever!!!!! At my favorite restaurant @catch (sic)''

The couple revealed they are to become parents again last week, by sharing a video of young Mia holding a sonogram with the caption: ''Well someone is going to be a big sister next year! We're so excited to share with y'all that I'm expecting again! (sic)''

But it wasn't long before she was facing criticism online from trolls who blasted her and Robin, 41 - who is also father to eight-year-old Julian, whom he has with ex-wife Paula Patton - for not getting married before starting a family together.

Blasting back at the haters on her Instagram story, April wrote: ''Why are women so obsessed with telling me I need a ring? Getting married is the easy part, seeing how you are together AFTER having babies is the hard part.

''We're in 2018. Not in the 1950's. Women don't NEED to get married before having babies. Ya'll need to chill (sic).''

Robin and April's baby joy comes after April revealed she tragically suffered a miscarriage before falling pregnant with Mia.

When asked during an Instagram Story Q&A if she was ''scared'' by the possibility of miscarrying, she said: ''I had one before Mia. But I'm not scared, worrying or stressing out too much isn't good for the baby. Life happens and we can't control everything.''

The couple's little girl is due on March 10, 2019, which will be Robin's 42nd birthday.