Katy Perry dissed Britney Spears on the Grammy's red carpet and fans aren't too happy

#KatyPerryIsOverParty has begun.

By Bianca Mastroianni
Katy Perry disses Britney Spears at 2017 Grammy Awards

The Grammy Awards are in full-swing, and already we've had a pro-Trump dress...

...Cee Lo Green dress as a robot...

...and now, Katy Perry taking a jab at Britney Spears.

Katy has just debuted her new hit single "Chained To The Rhythm"after a long while away from music, and while on the red carpet she told Ryan Seacrest that it was all for her mental health.

When Ryan asked how that was going, she responded with this:

She's obvs referring to Britney Spears' iconic 2007 meltdown, and fans are NOT having it.

Where's Chris Crocker when you need him?!