DJ Ruckus headlined a very special wedding ... for free.
Ruckus' friend/publicist, PR guru Amanda Ruisi who runs AKR Public Relations got hitched in Florida to banker Robert Sorrentino at the fancy schmancy St. Regis Bal Harbour.
Ruckus -- whose +1 was fiancee Shanina Shaik -- surprised everyone when he DJ'd the party well past 2am.
A set by Ruckus usually goes for $75k .. so free is definitely a bargain.
50 Cent, Pauly D and former Miss USA Erin Brady enjoyed the bash.
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