Comic Jerry Seinfeld is experiencing some shrinkage – as he used to say in his classic sitcom – because his joy factor has plummeted, and RadarOnline.com can reveal he's gone from life of the party to grumpy old man.

"Jerry turned his annoyances into a gold mine with his comedy performances and TV show, but the complaining used to be his secret weapon – and now it just gets on people's nerves," said an insider. Article continues below advertisement

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"This is one of the most successful people in the history of show business, financially and artistically, but he's almost allergic to counting his blessings. It's not a good look for a m

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