Zac Efron

Zac Efron posted an Instagram photo of him reading a children's book to his little sister Olivia on Tuesday, adding the sweet caption 'My Valentine'

I love you so much mom." [Zac Efron](http://people.com/tag/zac-efron) is revealing who stole his heart this Valentine's Day. Yeah, I don't know what to say now." "You know what? [Ellen DeGeneres in May](https://www.usmagazine.com/celebrity-news/news/zac-efron-cuddles-up-with-baby-sister-olivia-on-her-birthday-photo/) of his role as a "full-on" father in the 2022 adaptation of Stephen King's book. [The Greatest Showman](https://people.com/movies/michelle-williams-would-make-greatest-showman-sequel-in-a-heartbeat-i-really-love-that-movie/) actor, 35, shared an adorable image of [his 3-year-old sister Olivia](https://people.com/movies/zac-efron-posts-adorable-birthday-tribute-to-his-lil-sis-olivia/) on Instagram Tuesday captioned "My Valentine."

Zac Efron has an adorable little sister named Olivia, who he has shared photos of on his Instagram. See details on his younger sibling.

[younger brother, Dylan Efron](https://www.j-14.com/posts/celebrities-with-hot-siblings-zac-efron-florence-pugh-more/), who is four years younger than the Hairspray star. The pair, who shares the same parents, are super close and have even worked together, as Dylan is the coproducer of Netflix’s [Down to Earth](https://www.j-14.com/posts/zac-efrons-down-to-earth-season-2-what-we-know-so-far/), the show that follows Zac’s pursuit of a sustainable lifestyle. [ Zac Efron](https://www.j-14.com/tags/zac-efron-467/) has a little sister named Olivia? Keep reading to uncover more on his baby sister, including her age [and parents](https://www.j-14.com/posts/zac-efron-family-meet-the-actors-parents-brother-sister/). Starla filed for divorce from David in September 2016, citing “irreconcilable differences.” Zac’s dad married his second wife a few years later. Zac didn’t introduce his half-sister to his fans until she was 1 year old.

Zac Efron posed shirtless in a Valentine's Day photo with his baby sister, Olivia — see the sweet sibling tribute.

[welcoming children of his own](https://www.usmagazine.com/celebrity-moms/pictures/celebrity-dads-who-had-children-late-in-life-w457418/), pointing out that he has “a little bit more growing to do, probably,” before jumping into fatherhood. Along with Olivia — who is [David’s daughter from his second marriage](https://www.usmagazine.com/celebrity-moms/pictures/celebrity-parents-with-big-broods-large-families-pics/) — Zac is big brother to [Dylan Efron](https://www.usmagazine.com/celebrity-moms/pictures/famous-star-families-2010182/). [his big sibling duties](https://www.usmagazine.com/celebrity-news/pictures/celeb-siblings-2013107/), but he isn’t quite ready to have a little one of his own. [his relationship with Olivia](https://www.usmagazine.com/celebrity-moms/pictures/celeb-kids-meeting-their-siblings-for-the-1st-time-photos/), who was born in 2019. The California native noted that having costar Ryan Kiera Armstrong, then 12, by his side made a big difference. [uploaded the adorable pic](https://www.instagram.com/p/CopRevnObk9/?hl=en) on Tuesday, February 14, showing a glimpse of his sweet bond with his youngest sibling. We had a pretty heavy dad-daughter scene right off the bat, and I realized I was drastically underprepared for this part,” he joked on “[But] I think that was a healthy dose to put me off of [having kids] for as long as necessary.” “I didn’t know what I was doing. I thought it would just kind of click, but no, that’s not really the case!” Zac gave Olivia a sweet kiss on top of her head. The