“Grateful to be alive!!! ” Justin Bieber tweeted on Sunday. America’s most infamous teenage heartthrob — no longer a teenager — turned 21 years old on Sunday.

The Canadian singer rented a private island: “Sources close to Justin tell us he rented a Caribbean isle near Grenada for the ‘I’m finally legal’ bash … and based on this video, he had a great time celebrating with friends,” TMZ wrote.

So who was at Bieber’s bash? Social media told the tale.

Nineteen-year-old model and singer Yovanna Ventura posted this picture to Instagram:

https://instagram.com/p/zq9I0htntW

Talent manager Scooter Braun posted these:

Director and photographer Alfredo Flores, who appeared in Justin Bieber’s concert film “Believe,” posted these:

https://instagram.com/p/zrDgOaSvwG

View this post on Instagram

#21

A post shared by Alfredo Flores (@alfredoflores) on

From model Hailey Baldwin, once rumored to be dating Bieber:

https://instagram.com/p/zq9IIrFDKr

https://instagram.com/p/zrB86glDCP

And last but not least, the birthday boy himself posted this:

View this post on Instagram

Look at pops double chin

A post shared by Justin Bieber (@justinbieber) on