Dennis Rodman couldn't contain himself during his 50th birthday bash in Ft. Lauderdale -- jumping on stage, grabbing the mic, and belting out a shockingly good rendition of Pearl Jam's "Alive" ... and TMZ has the footage.
The rock sesh took place back in May -- as part of a month-long party to celebrate the NBA great's half-century milestone. Here's to fifty more?
PEARL JAM SING-ALONG
7/30/2011 12:20 AM PDT BY TMZ STAFF
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