We know he might be off the air for a little while ... but we still wanna see if you can guess who this late-night TV show host is!

We ran into this guy and his wife way back in 2017, when we caught him greeting a couple of fans while leaving a restaurant in L.A., and he was pretty popular -- back then, at least. You may also recognize a prolific celeb picture-collector known on the Hollywood streets ...

The thing is, the host in question here got pulled off the air earlier this month after making some comments about the circumstances surrounding a certain right-wing commentator ... so who knows when he's coming back?!

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