6 Times Scott Hoying & Mitch Grassi From Pentatonix Proved They Truly Are The Best Of Friends — PHOTOS

The first time I ever fell in love with a cappella music was when I purchased Rockapella's In Concert album in high school. I mean, who didn't love their Folgers commerical? Then, Pitch Perfect came out and I became an even bigger fan. For anyone else who can't get enough of a cappella music, there is now Pentatonix. If you're a huge fan of the band consisting of five vocalists, then you know they became super famous after winning the third season of NBC's The Sing-Off in 2011. Now, fans can't get enough of their music, and also want to learn all there is about each band member. Take best friends Mitch Grassi and Scott Hoying, for instance.

If you're not in the know, Grassi and Hoying have been friends for quite some time. Their friendship really blossomed after forming Pentatonix and winning The Sing-Off. They're so close in fact, that in 2014 they created a YouTube web comedy called Superfruit, on which they are both hosts. Both have even vocally expressed just how tight they are. Take this 2014 interview with AndPop, where they referred to one another as "best friends."

However, if you're in need of further proof, here are six times Hoying and Grassi proved they truly are BFFs.

1. When Scott Called Mitch His BF

Full-fledged proof.

2. When They Took This Selfie

Their selfie game is on point.

3. When Mitch Wrote This B-Day Message

That's real friendship.

4. When Mitch Called Scott "Justin Timberlake"

He's definitely a BF keeper.

5. When They Played Video Games

A true bonding experience.

6. When They Met Taylor Swift

This is something all BFFs should partake in together.

Yep, true best friends.