Zac Efron posted a shirtless photo while reading to his three-year-old sister, Olivia.
Source: Instagram
In this photo Zac is reading for little sister Olivia
Source: Instagram
The photo shows Zac's toned abs while Olivia snuggles up next to him holding a stuffed animal.
Source: Instagram
Zac's brother, Dylan, commented on the post claiming Olivia as his own valentine.
Source: Instagram
Zac frequently posts adorable photos with his little sister, including a recent slideshow for her birthday.
Source: Instagram
Zac often posts photos of himself working out or shirtless.
Source: Instagram