Jason Alexander Records Voicemail for Kat Dennings as George Costanza [VIDEO]

Imagine if you could get one of your favorite characters of all time to re-record your voicemail for you, in their voice? That's exactly what happened to Kat Dennings. She made the Seinfeld fan in all of us incredibly jealous when she had Jason Alexander re-record the answering machine message on her voicemail -- as George Costanza.

During The Late Late Show With James Corden, Kat admitted that for the past "five or six years," her answering machine message was taken from a YouTube recording of George's message on the show. In case you've never seen Seinfeld, George's message is himself singing a jingle that says, "Believe it or not / George isn't at home / Please leave a message at the beep / I must be out or I'd pick up the phone / Where could I be / Believe it or not I'm not home." Once Kat tells Jason that she's used that same jingle as her voice message for years, James Corden cuts in to suggest that Jason re-record her message himself, and he's totally down for it.

Although Jason needed a slight refreshing of the song -- which we completely understand, considering that Seinfeld went off the air back in 1998 -- he totally nailed it, even personalizing the song by using Kat's name instead of saying George. Kat is, clearly, totally overjoyed by the fact that she now has a personalized answering machine from Jason Alexander himself.

You can check out the video above to see it all go down.