Last fall, DAVID CASSIDY dared DANNY BONADUCE . . . who played his younger brother on “The Partridge Family” . . . to learn one of the Partridge Family songs, and perform it with him.  And it actually happened on Saturday night in Atlantic City.

They performed “Doesn’t Somebody Want to Be Wanted”.  (***WARNING***:  David drops an S-bomb 14 seconds in.)

Before beginning, Danny asked the crowd, quote, “You want to see something nobody has ever seen before?  Me, plugging in a bass guitar!”  Danny pretended to play the bass and lip-synced on the show.  David sang for real.

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