What's up with the celebrity lookalikes in commercials recently?

First time I noticed it was a couple months ago, in that commercial for the Polaroid digital camera where the Todd Oldham (above) doppelgänger hides his camera inside his pants and then, in some super swanky club a la Bungalow 8 or its ilk starts emitting flashes of flight from his fly until some ominous hulk of a bouncer throws him out.

He finds himself out on the sidewalk with some megababe who mimics his dorky dance moves and I guess the message of the commercial is that if you buy the camera, in the end you get the girl.

Dumb, dumb commercial, though: I must have watched it twenty or thirty times before I realized it was for Polaroid.

Boy, does the guy resemble Todd Oldham, though.

Then just now I'm sitting here doing something close to nothing (but different from the day before) when up pops a Dr. Pepper commercial starrring a woman who at first glance appears to be Elizabeth Berkley (below),

of "Saved By The Bell" and, much more recently, "Showgirls" fame.

FunFact: Quentin Tarantino had nothing but praise for "Showgirls."

A dead ringer for Ms. Berkley, is the girl in the commercial.

The thing is, I'd bet most people watching these two commercials don't have the faintest idea what Todd Oldham looks like, nor Elizabeth Berkley.

Is it some unconscious impulse on the part of the ad agencies casting these commercials, using these dead ringers?