Rockers Chad Smith, Duff Mckagan, and Mike Mccready formed a supergroup for a one-off performance at a charity benefit hosted by Will Ferrell on Friday (19Sep14).

The Red Hot Chili Peppers drummer put aside his "feud" with Ferrell to support the comedian's Cancer for College fundraising event at the University of Washington in Seattle.

Smith was joined onstage by Guns N' Roses guitarist MCKagan, Pearl Jam star MCCready, country singer Brandi Carlile and bassist Stefan Lessard to perform a version of the Rolling Stones hits Honky Tonk Women and Jumpin' Jack Flash under the supergroup name I P**sed My Pants.

Ferrell, who played the cowbell during the first song, frequently supports the Cancer of College cause due to his friendship with founder Craig Pollard.

The Anchorman star's rivalry with Smith began earlier this year (14) after Ferrell mocked the similarity of their appearance. Their light-hearted feud culminated in a drum battle on The Tonight Show with Jimmy Fallon in May (14).