A Marvel star gave fans a heartwarming glimpse into his childhood on Friday, sharing an adorable throwback to celebrate his sister’s milestone birthday.

Just one day after honoring his siblings for National Siblings Day, Chris Pratt turned the spotlight on his sister Angie for her big day.

The Guardians of the Galaxy actor, 45, took to Instagram to post a carousel of snaps featuring himself, brother Cully, and Angie as kids — arms slung around each other in front of a twinkling Christmas tree.

The final pH๏τo showed the trio all grown up, grinning around a table as they played cards and shared laughs.

‘Holy Smokes how did it happen!? I can’t believe your 50 sis!,’ Pratt wrote alongside the pH๏τos. ‘Love you so much!!! Love the woman you are. You’re an excellent wife, sister, mother and friend. The funniest person I know!’

He added, ‘Sending you so much love today and every day! Happy Birthday Sissy!!!’

A Marvel star (LEFT) gave fans a heartwarming glimpse into his childhood on Friday, sharing an adorable throwback to celebrate his sister’s milestone birthday

The Guardians of the Galaxy actor (LEFT), 45, took to Instagram to post a carousel of snaps featuring himself, brother Cully, and Angie as kids — arms slung around each other in front of a twinkling Christmas tree

Just a day earlier, the Jurᴀssic World star had paid tribute to both Cully and Angie, posting a siblings’ snapsH๏τ for National Siblings Day and captioned it, ‘Happy #nationalsiblingsday!! Wouldn’t want to go through life with anyone else. Cully and Angie… I love you both.’

His wife, Katherine Schwarzenegger — daughter of Arnold Schwarzenegger and Maria Shriver — also celebrated the occasion with her own sentimental post. 

Read More Patrick Schwarzenegger reveals White Lotus incest scene was ‘fun’

She shared childhood pH๏τos alongside siblings Patrick, Christopher, and Christina.

‘My heart and soul. The best people I know. My people,’ wrote Katherine, 34. 

‘Grateful every day for them and wish I could keep them in my pocket because I want to do everything together. (Oldest sister thing?)’

Chris, who grew up with a mother working in a grocery store and a father in construction (who pᴀssed away in 2014), has spoken candidly about how fame affected his family dynamic. 

In a 2015 interview with The Talks, he opened up about their reactions.

‘It’s pretty weird,’ he said. ‘My brother is super supportive and always has been. He has hugely shaped who I am today. He gives me s— and keeps me grounded, which is nice. But it’s an interesting situation because sometimes it’s the people that are closest to you that it can be hardest on.’

The final pH๏τo showed the trio all grown up, grinning around a table as they played cards and shared laughs

‘Holy Smokes how did it happen!? I can’t believe your 50 sis!,’ Pratt wrote alongside the pH๏τos. ‘Love you so much!!! Love the woman you are. You’re an excellent wife, sister, mother and friend. The funniest person I know!’

Just a day earlier, the Jurᴀssic World star had paid tribute to both Cully and Angie, posting a siblings’ snapsH๏τ for National Siblings Day

He captioned the Sibling post, ‘Happy #nationalsiblingsday!! Wouldn’t want to go through life with anyone else. Cully and Angie… I love you both’

Chris, Katherine Schwarzenegger, Arnold Schwarzenegger, and Christina Schwarzenegger in  2023

His wife, Katherine Schwarzenegger — daughter of Arnold Schwarzenegger and Maria Shriver — also celebrated the occasion with her own sentimental post 

‘They’re like, “What the f— dude? How did you stumble into an awesome acting career when I’m working 40 hours a week at a job that I don’t necessarily love just to barely keep my head above water?”’ Pratt added. 

‘It happened to me and I’m grateful, but I know that it can be extra hard on people that are closest to me, because it gives you some sort of skewed perspective.’

Meanwhile, Pratt recently went viral for his jaw-dropping reaction to brother-in-law Patrick Schwarzenegger’s racy White Lotus appearance. 

The 31-year-old son of the Terminator icon plays the hyperSєxual Saxton in season three of the hit HBO series — and made quite the splash with his full-frontal debut in the first episode.

‘I know where my eyes went. I’m not blood-related to him — I was looking at that d**k, bro,’ Pratt hilariously told E! News.