Sam & Cat co-stars Ariana Grande and Jennette McCurdy are both celebrating a birthday today. We can't believe the besties star on the same show and were born on the same day. Talk about awesome!

It's an exciting day for both girls — Ariana is saying goodbye to her teen years and turning 20, and Jennette is turning 21.

In celebration of their big day we've found 20 of Ariana and Jennette's cutest and funniest pics together. Click through and let us know which photos you like best. Don't forget to leave your birthday wishes in the comments section below!