Jason Alexander -- What's the Deal with My Seinfeld Impression?

If you can't get Jerry Seinfeld to do it, who better to judge someone's Seinfeld impression than the man who played his best friend for nine seasons ... Jason Alexander.

Not only did Alexander tolerate our photog's attempt to do Jerry outside Spago yesterday in Beverly Hills, but the man best known for playing George Costanza even gave our guy a handful of constructive feedback ... and gave him a pretty good overall rating.