Miley Cyrus has a rocky friendship history with Taylor Swift seeing as they appear to be friendly one minute and then they're suddenly not.

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Cyrus reportedly dissed Swift at the Saturday Night Live 40th Anniversary after party, which took place Sunday night into Monday morning.

Hollywood Life reported Wednesday via In Touch Weekly that the Wrecking Ball singer threw a tantrum since she did not get to perform with Paul McCartney, but Swift did. 

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An eyewitness claimed Cyrus appeared crushed when the Style singer got to share the stage with McCartney.

Cyrus apparently told those sitting around her some really harsh things about Swift.

"Her guitar wasn't even plugged in" and "Those aren't even real chords! She's not even playing," were amongst the things Cyrus reportedly said.

Cyrus reportedly even lashed out at her boyfriend Patrick Schwarzenegger during her tantrum so he left to wait by the elevator for her.

Cyrus has reportedly dissed Swift before according to various reports.

Last May, the site reported via OK! that Cyrus claimed Swift could not keep One Direction's Harry Styles around since she is a "sexless, frigid ice princess" and clearly "bored" the boy band member.

The girls were once fairly close seeing as Swift even had a song, Crazier, on Cyrus' Hannah Montana: The Movie soundtrack and appeared in the movie too, but they have certainly grown apart over the years.

Tags: Miley Cyrus Taylor Swift