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Former 98 Degrees frontman Jeff Timmons is back onstage -- this time in Las Vegas as a part of the Chippendales show!

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The 38-year-old told TMZ last month he would take off his shirt for the act, but nothing more. "[The Chippendale regulars] don't even strip… they're like trained dancers," he said. "The days of your grandma sticking dollar bills in a stripper's G-string are over."

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But to the delight of the screaming audience, Timmons ripped off his fitted white T-shirt and tossed it into the crowd during his debut on May 12. He then continued to sing for the roaring crowd, flaunting his chiseled abs and pumped-up pecks.

Timmons will continue his stint as the Chippendales' musical act through June 5.

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