PAUL MCCARTNEY performed with surviving NIRVANA members Dave Grohl, Krist Novoselic and Pat Smear on Wednesday, December 12th at Hurricane Sandy charity concert 121212, at Madison Square Garden in New York City. Check out a photo of Grohl donning a SLAYER t-shirt while hanging with McCartney and BRUCE SPRINGSTEEN below:

Although Courtney Love (Kurt Cobain's widow) wasn't impressed, Grohl, Novoselic, Smear along with McCartney performed the new track, 'Cut Me Some Slack', and introducing the song McCartney stated: "So recently some guys asked me to go and jam with them. So I showed up, like you do, ready to jam... and in the middle of it, these guys kept saying, 'You know, well, we haven't played together for years, you know?' So, the penny finally dropped, I finally understood that I was in the middle of a Nirvana reunion."

Check out the performance below:

It was previously reported that McCartney had been secretly working in the studio with Grohl and Novoselic, who formed the main line-up of the iconic grunge band Nirvana, along with singer and guitarist Kurt Cobain who committed suicide in 1994.

The 70-year-old said he received a phone call from Grohl, asking him to come and ‘jam with some mates’.

He found himself playing alongside Novoselic and unofficial fourth Nirvana member Pat Smear, but confessed: ‘I didn’t really know who they were. They are saying how good it is to be back together. I said “Whoa? You guys haven’t played together for all that time?”

‘And somebody whispered to me “That’s Nirvana. You’re Kurt.” I couldn’t believe it.’