An exuberant fan at Paul McCartney's Grand Rapids show groped the rock superstar.

During the encore of the sold-out show at Van Andel Arena, Paul McCartney invited fans with signs onstage for a chat.

This West Michigan woman's request was unique

I want to touch your bass.

Being asked to clarify which one she actually meant, the dumb-struck fan was only able to point to the former Beatles' backside.

A true gentleman, Sir Paul honored the request and let the fan touch his bum. He then offered his trademark Hofner bass guitar and a hug.

Whereupon the woman grabbed another cheeky handful before being escorted offstage.

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