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Chris Pratt shared a heartfelt birthday message for Katherine Schwarzenegger

Chris Pratt arrives for the 2018 MTV Movie and TV Awards June 2018 and Katherine Schwarzenegger in 2014 (NINA PROMMER/EPA/Shutterstock (Pratt) and Kevork Djansezian/Getty Images)
NINA PROMMER/EPA/Shutterstock (Pratt) and Kevork Djansezian/Getty Images
Chris Pratt and, separately, Katherine Schwarzenegger.

Chris Pratt is extremely thankful for Katherine Schwarzenegger.

The “Guardians of the Galaxy” actor posted a photo collage of Schwarzenegger, the daughter of actor Arnold Schwarzenegger and journalist Maria Shriver, on Instagram Thursday in celebration of her 29th birthday.

“Happy Birthday Chief!” Pratt, 39, wrote. “Your smile lights up the room. I’ve cherished our time together. Thrilled God put you in my life. Thankful for the laughs, kisses, talks, hikes, love and care.”

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Pratt and Schwarzenegger were first linked in June when photos surfaced showing the two having a picnic together in Santa Barbara, Calif. E! reported that Pratt was “smitten” with Schwarzenegger, and that Shriver helped set them up.

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Schwarzenegger is a lifestyle blogger and author who released her first book, “Rock What You’ve Got: Secrets to Loving Your Inner and Outer Beauty from Someone Who’s Been There and Back,” while still in college. She’s also part of the “new generation” of the Kennedy clan, as the granddaughter of Eunice Kennedy Shriver and Sargent Shriver.

In December 2017, Pratt split with actressAnna Faris, to whom he’d been married since 2009. The pair reportedly finalized their divorce in October.

Kevin Slane can be reached at kevin.slane@globe.com.