For me, Valentine's Day is the perfect occasion to celebrate all things love, whether single or in a couple, and Zac Efron, who is currently single, seems to understand this all too well.

The "High School Musical" star read an adorable storybook to his 3-year-old sister Olivia on the couch on February 14. Olivia seemed completely engrossed in the pictures and hugged what looked like a toy wolf or dog as Zach narrated the story.

Zach posted a photo of this lovely sibling moment on Instagram with the comment, "My valentine #happyvalentinesday."

Zach's brother Dylan, 31, is much closer in age to Zach (35), but "no she's mine." Correction.

Zach and Dylan share parents David Efron and Starla Baskett, and according to Us Weekly, little Olivia was born to David and his second wife Jenny in 2019.

The "The Greatest Showman" star has dedicated heartwarming Instagram posts to Olivia in the past, most recently celebrating her birthday with a photo of the two sharing a sweet hug.

Zac's best-known romance was with model Vanessa Valadares until their breakup in April 2021; according to Us Weekly, the star had previously been seen with Lily Collins in "Emily in Paris," Alexandra in "White Lotus," Daddario, and "High School Musical" co-star Vanessa Hudgens.

Hudgens, by the way, recently became engaged to her partner of two years, Cole Tucker, a professional baseball player for the Colorado Rockies, according to Entertainment Tonight.