Zac Efron melts hearts everywhere as he takes to Instagram

Zac Efron melts hearts everywhere as he takes to Instagram to wish his younger sister a happy birthday

Zac Efron melts hearts everywhere as he wishes his younger sister a happy birthday in a touching Instagram post

Zac Efron melted the hearts of his 56.7 million Instagram followers on Monday when he posted a birthday tribute to his little sister Olivia.

The 33-year-old heartthrob – who had his pulse racing earlier this month as he worked out shirtless – posted some sweet pictures of him holding his adorable 2-year-old sibling.

Olivia appears to be the daughter of Zac’s father, David Efron, and his second wife, making little Olivia Zac’s half-sister.

Melting hearts: Zac Efron, 33, melted the hearts of his 56.7 million Instagram followers on Monday when he posted a birthday tribute to his adorable 2-year-old sister Olivia

Melting hearts: Zac Efron, 33, melted the hearts of his 56.7 million Instagram followers on Monday when he posted a birthday tribute to his adorable 2-year-old sister Olivia

“Happy Bday lil sis,” the High School Musical star wrote, captioning two adorable pics.

The first picture shows Zac holding Olivia as she gazes fondly at his mustachioed face with chiseled features, leading to widespread speculation that the star has undergone plastic surgery.

The little girl’s floral headband held her golden tresses in place as she gazed at her big brother, who wore a festive green button.

Zac’s clean trimmed hair has been lightly styled with gel, giving it an effortless look that goes well with his rugged looks.

Always perfectly tanned, the Baywatch star sported a sexy holiday glow.

Cuteness overload:

Cuteness overload: “Happy bday lil sis,” captioned the High School Musical star. The cute pair of pictures showed Zac holding Olivia as she gazed up lovingly at his mustachioed, sculpted face before snuggling into his chest as he kissed her on the head

If Zac’s first picture didn’t make his fans faint, then his next picture sure was a killer.

Olivia snuggled into her big brother’s chest as Zac gripped her tightly and kissed her head.

‘Why isn’t this man married yet?!’ commented one Efron superfan.

‘Could you please be the father of my children?’ asked an amorous follower.

‘Will you hold me like this?’ gushed another suitor, echoing many amorous sentiments overflowing from his comments section.

The leading actor is reportedly still single after splitting from model/waitress Vanessa Valladares.

A-list big brother: Olivia is rarely seen on Zac's Instagram, but he posted another cute picture of him holding her last year

A-list big brother: Olivia is rarely seen on Zac’s Instagram, but he posted another cute picture of him holding her last year

Too adorable: Olivia appears to be the daughter of Zac's father David Efron and his second wife, making little Olivia Zac's half-sister (pictured last year) Too adorable: Olivia appears to be the daughter of Zac's father David Efron and his second wife, making little Olivia Zac's half-sister (pictured last year)

Too adorable: Olivia appears to be the daughter of Zac’s father David Efron and his second wife, making little Olivia Zac’s half-sister (pictured last year)

Aside from making millions swoon on Instagram, Zac’s top priority seems to be his career as he has a ton of big projects in the works.

The A-lister recently directed a rom-com for Netflix called The Family Affair, starring Joey King, 23, and Nicole Kidman, 55.

And the star is currently hard at work on wrestling biopic The Iron Claw, starring Lily James, 33.

Efron never misses a chance to fuel up for a role, and his muscular physique makes his jaw drop when he plays heavyweight champion Kevin von Erich.

Zac has come a long way from his teenage idol days, making the treacherous leap from Disney to the mainstream and becoming a bona fide movie star in the process.

But one thing that hasn’t changed is his ability to swindle millions.

Giddy on up: The heartthrob has certainly come a long way from his teenage idol days, making the treacherous leap from Disney to the mainstream and becoming a bona fide movie star in the process.  But one thing that hasn't changed is his ability to swindle millions

Giddy on up: The heartthrob has certainly come a long way from his teenage idol days, making the treacherous leap from Disney to the mainstream and becoming a bona fide movie star in the process. But one thing that hasn’t changed is his ability to swindle millions