A website did side by side comparisons of celebrities and the other celebrities they look like.  Here are a few I found funny or amazing.

Kevin from the Office and Cowboy's guard Greg Isdaner

Chilli Peppers Drummer Chad Smith and Will Ferrel

John Edwards and Kenneth from 30 Rock

Geico Caveman and Johnny Damon

Kenny G and Weird Al

Donatella Versace adn a Muppett