Paris Hilton Wins $50,000 on Blackjack ... AFTER $100,000 DJ Gig

The rich just keep getting richer -- mere hours after Paris Hilton was paid $100,000 to DJ in Atlantic City Saturday night ... she won $50K at the blackjack table.

Paris kicked off her residency at Harrah's "Pool After Dark" with a blowout -- DJ'ing for a sold out crowd -- and sources tell TMZ, she got paid $100,000 for the job.

We're told the party was a blast -- the first of many DJ gigs for Paris at Harrah's -- but the craziest part was when she left the club and hit the blackjack table ... where she increased her night's haul by 50% ... winning another $50,000.

Whoever said life is fair?