The model shared a photo of her sonogram on Friday, writing the sex of her baby using female pronouns.
“You guys!!! Look what I’m making!!!! Note her foot that’s over her head. Got long legs like her mama! ,” she wrote in the caption.
The model announced her pregnancy on Instagram in August, writing: “Robin and I are very excited to share with you all that we’re having a baby! The due date is March 1st, Alan’s birthday!”
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.
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.