Robin Thicke and fiancée April Love Geary. (Courtesy)

Robin Thicke's fiancée April Love Geary has confirmed she's pregnant with their third child together. She took to her Instagram account on Sunday night to post a picture of herself in a black bikini, showing off her growing baby bump. Later she posted on her Instagram Story to reveal when the baby is due, confirming they will welcome their new arrival in December.

The 25-year-old is already mum to Mia, two, and one-year-old Lola with Robin, 43, who she's been engaged to since Christmas Eve 2018. Robin is also dad to Julian, 10, with his ex-wife Paula Patton, 44. In her announcement picture, April posed cross-legged on a beach blanket as she relaxed on the beach.

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Robin Thicke's fiancée April Love Geary pregnant with third child. (Courtesy)

Kids toys surrounded her as she smiled for the camera while sitting under an umbrella. She captioned the post: "Sorry we can't hang out, there's a pandemic & I'm pregnant... again. We love consistency!" On her Instagram stories a fan asked when her baby is due and she answered "December!".

Also on her stories she confirmed the pregnancy wasn't planned but they "decided to roll with it". She then said that they were planning to marry after their Malibu home, which was destroyed in a wildfire two years ago, is rebuilt.

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A fan asked if the couple want to get married and she said "of course!". April added: "But I want to wait until our house is rebuilt after losing it in the fires a couple years ago."