THIIIIIISSSS ... is "American Idol" meets "Cops."

The person in this mug shot is NOT Ryan Seacrest ... but, c'mon, the resemblance is uncanny!!!

One of our eagle-eyed users was perusing the booking photos when she found this guy -- who looks strikingly similar to Seacrest.

In fact, they're both the same age (42) and height (5'8").

Unfortunately for this dude, cops say he was recently busted on a meth charge -- so that sucks. Hopefully, he can get his life together.

But if Seacrest ever wants to call in sick ... hey, we got your stand-in!!