Can't punk us!

At Wednesday's TCA panel for Two and a Half Men in Pasadena, Calif., Ashton Kutcher wore a silver band on his ring finger. But a source tells Us Weekly that Demi Moore's ex wasn't wearing actually his wedding ring.

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"He was playing with the ring," a witness says. "It was silver and wide, but it turned out to be not a full-fledged band."

Indeed, a Kutcher source tells Us, "it wasn't his wedding ring. It was just a ring."

PHOTOS: 2011's biggest splits

The conspicuous piece of jewelry wasn't the only thing that stood out about the 33-year-old actor. The newly-shorn star debuted a different look, which no longer included his shaggy mane and trademark facial hair. 

His clean-shaven appearance is "related to the show, completely," he said at the panel. "Tune in Monday!"

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Kutcher and Moore, 49, were married for six years before they confirmed their split in late November following his affair with Sara Leal. 

Charlie Sheen told reporters earlier this week he was "kind of impressed" by his Two and a Half Men successor's affair scandal. "I thought, 'Hey, man, make it colorful!'"

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