It was one of the worst kept Hollywood relationship secrets, but now actor Chris Pratt has made it Instagram-official. He is dating Katherine Schwarzenegger, daughter of actor and former governor, Arnold Schwarzenegger and his ex-wife, Maria Shriver.

Pratt, 39, posted photos and a birthday message for Katherine Schwarzenegger. While the couple has been in other family members' social media posts, this is one of the first Instagram collage posts of his girlfriend made by the Marvel and "Jurassic World" actor, USA Today reported.

He made the post in honor of Schwarzenegger’s 29th birthday.

She runs a lifestyle blog and has written a book, "Rock What You Got," USA Today reported.

Pratt and his wife of eight years, Anna Faris, separated in 2017, CNN reported. They had a son, Jack.

On Tuesday night, Pratt was photographed with Katherine's younger brother Patrick at the LA Clippers game, People reported.

In this handout photo provided by Disney Resorts, Chris Pratt narrates the story of Christmas during Disneyland's annual Candlelight Processional on December 01, 2018 at Disneyland in Anaheim, California. The tradition of the Candlelight Processional began in 1958 with Walt Disney. Pratt officially acknowledged his relationship with Katherine Schwarzenegger on social media.

Credit: Joshua Sudock/Disney Resorts via Getty Images

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Credit: Joshua Sudock/Disney Resorts via Getty Images

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