Punters at the Manchester Zappa Plays Zappa gig were treated to a guest appearance of Guthrie Govan, as Dweezil himself blogged:

Tonight in Manchester my friend Guthrie Govan played with us. He’s a very fine guitarist with superhuman precision. I enjoyed having him onstage. I kept suggesting different musical styles for him to play over and he nailed all of them. Country, Lounge Jazz, super wristy funk and a Classical Etude. Then he let loose on a crazy yet musical solo before we played a few notes together.

…and luckily enough someone caught some footage of it

All hail The Govanator.