Floyd Mayweather knows how to throw a party ... just ask his daughter, who turned 16 and got a shindig suitable for royalty.
The bash set Floyd back 7 figures. It went down Saturday ... a BBQ in the afternoon followed by a blow-out at the Mirage Grand Ballroom in Vegas. Performers -- Drake and Future, of course.
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Iyanna scored a G-Wagon from dad, and a video wishing her happy b-day from Justin Bieber.
Her friends shouldn't bother to even try one-upping her.