Post Malone was joined by some special guests during his set for the “Bud Light Seltzer Sessions Presents: New Years Eve 2021” virtual event last night (December 31). Among them were Red Hot Chili Peppers drummer Chad Smith, producer/guitarist Andrew Watt, and Jane’s Addiction bassist Chris Chaney, who joined the rapper for some covers of Alice in Chains’ “Rooster” and Black Sabbath’s “War Pigs,” the latter of which also featured Guns N' Roses guitarist Slash. You can see footage of the aforementioned tracks at the 2:11:11 mark in the below video: