“Happy Days” stars Henry Winkler, Anson Williams and Donny Most reunited in Salt Lake City, Utah on Thursday afternoon during a FanX convention panel.

The group started their appearance with a special celebration.

It was Williams’ 76th birthday, and Winkler came prepared with a chocolate cake to share with a select few and led the crowd through a squeaky rendition of “Happy Birthday.”

The singing didn’t end there.

Most and Williams — who both sang on several episodes of “Happy Days” — duetted a mashup of “Put Your Head on My Shoulder” by Paul Anka and “Splish Splash” by Bobby Darin, as the audience clapped along.

Once the three aging sitcom stars had all taken an opportunity to sing, they shared a few behind-the-scenes memories from the decade they spent filming “Happy Days.”

Fonz’s

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