Happy 28th Birthday, Zac Efron! Celebrate With the Hunky Actor's Sexiest Shirtless Pics

Neighbors star has treated his fans to plenty of photos of his hod bod on and off-screen

Oh, Zac Efron. How your washboard abs make us swoon. 

The hunky actor turns 28 today, so it's only fitting we've compiled an entire gallery of his steamiest shirtless pics for your enjoyment. Zac has come light years since his High School Musical days, flourishing from a bright-eyed teen idol to a full-fledged movie star with a hot bod to boot!

But unfortunately for all the ladies out there, Efron is definitely off the market. The We Are Your Friends star recently shared his one-year anniversary with girlfriend Sami Miró, and last year the duo celebrated Efron's special day in Amsterdam. There's no telling how they'll top the European vacay, but we're sure Sam's got something big up her sleeve for her man's big 2-8. 

For more shirtless Efron moments, check out the gallery below. You'll thank us later!