Can You Guess Which Hollywood Heartthrob Tweeted Out This Adorable Childhood Pic? (PHOTOS)

Guess the Celebrity Sibling!
See if you can spot the famous resemblance.
Reach for the sky!

Before this actor made ladies swoon in rom-coms and beyond, he too was just a little tyke playing dress up. Looks like he’s always had the acting bug!

Any guess as to who it could be?

We’ll give you a hint — it’s his birthday today, and he has two different movies coming out this summer. Still don’t know? Put on your thinking cap, and play our guessing game in the gallery!