Engaged since October, the couple exchanged vows at the Vibiana in downtown L.A.
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Ray J's sister, Brandy, sang at the ceremony, after which Princess posted a "Just Married!" message on Instagram.
Princess has succeeded in getting one of Hollywood's most eligible bachelors to settle down after nudging him publicly over keeping their engagement under wraps, with hints about it at the BET Hip Hop Awards and elsewhere.
Ray J's high-profile relationships prior to Princess were with Whitney Houston, who he was dating at the time of her death, and Kim Kardashian. His sex tape with Kardashian catapulted her to fame 13 years ago.