Chris Pratt Celebrates 4th Birthday of His ‘Sweet Girl’ Lyla Maria: ‘You Came Down from Heaven’

Pratt celebrated Lyla Marie's fourth birthday with a sweet collage of images on Tuesday, August 6

Chris Pratt is celebrating a special birthday!

On Tuesday, August 6, the proud dad, 45, shared a birthday message to his eldest daughter Lyla Maria as she turned four.

"Happy 4th Birthday to my sweet girl,” Pratt — who shares Lyla with wife Katherine Schwarzenegger — wrote in an Instagram caption as he shared a photo of Lyla sitting on his shoulders. “As long as I’m living my baby you’ll be!!!”

A second photo, featured the birthday girl outdoors with her back against the camera again as she stood on a rock and looked at a view of mountains and trees.

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Related: Chris Pratt's 4 Kids: All About Jack, Lyla, Eloise and His Baby on the Way

Pratt then shared a collage of four photos on his Instagram Stories, featuring items Lyla had "bedazzled."

“Hard to believe just four years ago you came down from heaven,” the actor wrote across the snaps. “And now everything I own is bedazzled with pink hearts and purple gem stickers. #girldad.”

Lyla's mom, 34, also celebrated her daughter's birthday with an Instagram tribute on Tuesday.

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"My little girl is 4 and I can't believe it," Schwarzenegger wrote across a photo of a Happy Birthday banner on her Instagram Stories.

"Happy 4th birthday to my Lyla girl! I love you more than you know ♥️," she added as she shared a photo of her daughter looking at a bunch of pink balloons.

In addition to Lyla, Pratt shares daughter Eloise Christina, 2, with Schwarzenegger. He also shares son Jack, 11, with ex-wife Anna Faris.

Related: Arnold Schwarzenegger Is in Grandfather Mode in Chris Pratt’s Birthday Tribute: ‘Looking Forward to Another Year of Sage Advice’

A source confirmed to PEOPLE in June that Pratt and Schwarzenegger are also expecting their third baby together.

The Guardians of the Galaxy star later shared a snap of his wife showing her her baby bump last month.

“Greatest party planner in history,” he wrote at the time in reference to a Western-themed party she had planned.

Schwarzenegger appeared in great spirits as she smiled at the camera and dressed her bump in pink dungarees.

A second photo then featured the couple’s daughters standing in a petting zoo area.

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