Robin Thicke posted a photo with his pregnant girlfriend during a family outing to the beach Saturday.

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The 40-year-old singer shared a picture with April Love Geary and Julian, his 7-year-old son with ex-wife Paula Patton, following news he and Geary are expecting.

"Happy days!" he captioned the snapshot on Instagram.

The photo shows the trio smiling as they pose for the camera. Thicke and Geary, 22, both wear Los Angeles Dodgers hats, with the mom-to-be in a matching blue, high-waisted bikini.

Thicke and his family have been vacationing in Hawaii since last week. Geary announced she's pregnant and expecting her first child with Thicke in an Instagram post Thursday.

"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," she wrote, referencing Thicke's late dad, Alan Thicke.

Thicke and Geary started dating in 2014 following the singer's split from Patton after nearly nine years of marriage and 21 years together.

E! News reported Friday that Thicke and Patton will share custody of Julian following a years-long custody battle.

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Julian will stay with Thicke Monday through Wednesday, and with Patton Wednesday through Friday.

He will alternate weekends with his parents, with holidays and summer vacation to be split as equally as possible.

"The parties are ordered to share in all major decisions concerning the minor child's health, education and welfare are including, but without limitation, schooling, religion, medical care and enrichment activities," court documents read.