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In the cute photo, a shirtless Efron is seen reading a children's book on a couch while Olivia cozies up to him and hugs a stuffed animal.
Efron previously posted about his little sister in December, when he melted hearts by wishing Olivia a happy birthday.
"Happy bday lil sis," a mustache-wearing Efron captioned the set of photos of his baby sister looking up at him with a crocheted flower crown on her head.
A second photo showed the California native lovingly kissing the top of Olivia's head as she rests her head on his chest with closed eyes.
Zac Efron/Instagram Zac Efron and his little sister Olivia
The Baywatch actor also previously posted about his sister in 2021, sharing a photo of him holding her close with the caption: "My sister Olivia, little heartbreaker."
The High School Musical alum recently admitted that he felt underprepared to play a dad in his 2022 horror film Firestarter.
"You know what? I think that was a healthy dose to put me off of it for as long as necessary," he told Ellen DeGeneres in May of his role as a "full-on" father in the 2022 adaptation of Stephen King's book. "I have a bit more growing to do, probably. I don't know. Yeah, I don't know what to say now."
Though he added in tribute to his mom, Starla Baskett: "I have a healthy respect for parents, very grateful for them all. I love you so much mom."
In November, Efron was seen on the New Orleans set of his upcoming wrestling movie The Iron Claw, wearing wore a grey tank top, cutoff jean shorts, white Nike sneakers and white socks, complete with a muscular look and bowl cut for his portrayal of former pro wrestler Kevin Von Erich.
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A24's official logline for The Iron Claw states that the Sean Durkin-directed movie tracks the "rise and fall of the Von Erich family, a dynasty of wrestlers who made a huge impact on the sport from the 1960s to the present day."
That dynasty started with pro wrestler Fritz Von Erich — real name Jack Adkisson — who began wrestling professionally in the 1950s and later became an influential promoter for World Class Championship Wrestling, reported The Daily Mail.