Kanye West launched into a shocking, expletive-ridden rant just before he was due to appear on Saturday Night Live over the weekend.

Kanye West slams Taylor Swift

In audio obtained by Page Six, the furious rapper, who threatened to walk off the show after his set was altered at the last minute, can be heard yelling at production staff and also lashes out at Taylor Swift once again.

"Look at that s**t, they took my f**king stage off of SNL without asking. Now I'm bummed," he fumes. "That and Taylor Swift — fake a**."