zac efron

He fell ill while filming his new documentary.

Zac was flown to Australia for treatment.

Check out how your favorite celebrities have transformed over the years.

See how your favorite celebrities have transformed since they first made it big.

From photos of exes to caption mishaps, we've rounded up 25 instances celebrities deleted posts from their Instagram feeds.

These celebrities are sober.

From pop stars to sports stars, check out 20 celebrities who embrace the vegan lifestyle.

The reactions are... mixed.

The 'High School Musical' co-stars dated for roughly four years.

From Nick Jonas to Khloe Kardashian and beyond, check out 30 surprising celebrity glow-ups over the years.

'Extremely Wicked, Shockingly Evil and Vile' hits Netflix and select theaters May 3.

What do we think of the actor's new 'fun' hairstyle?