The model announced her pregnancy on Instagram Thursday, writing: “Robin and I are very excited to share with you all that we’re having a baby! The due date is March 1st, [Robin’s late father] Alan’s birthday!”
In addition Geary, 22, shared a photo of her sonogram, which was dated Aug. 14. TMZ reports that the baby is a girl.
The parents-to-be started dating in the months following his separation from the actress in February 2014. Patton filed for divorce in October 2014 and in March 2015, their divorce was finalized. Earlier this year, the former couple were embroiled in a lengthy custody dispute, which now appears to be resolved.
Thicke and Geary made their first public appearance together at the Cannes Film Festival in May 2015 after dating for over a year.
On Wednesday, Geary shared a bikini photo and first look at her baby bump during her vacation in Hawaii.
Both Thicke and Geary frequently post about their romance on social media and she has previously joked about the couple’s 18-year-age gap in April.