DJ Cassidy's Birthday Party

DJ Cassidy celebrates his birthday at the New York Public Library. See photos.

Birthday Boy - DJ Cassidy celebrated his 28th birthday party at the New York Public Library in New York City. It was a star-studded affair.

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Birthday Boy - DJ Cassidy celebrated his 28th birthday party at the New York Public Library in New York City. It was a star-studded affair.

House Of Hip-Hop - Nas was among the many celebrity rappers to stop by to wish DJ Cassidy a happy birthday.

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House Of Hip-Hop - Nas was among the many celebrity rappers to stop by to wish DJ Cassidy a happy birthday.

Treach: December 2 - The Jersey rapper celebrates his 40th birthday.

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Naughty By Nature - The red carpet saw the likes of many hip-hop heads. Treach of Naughty By Nature posed for pics.

DJs Come Out At Night - New York City's own DJ Funkmaster Flex stopped by to support his fellow DJ.

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DJs Come Out At Night - New York City's own DJ Funkmaster Flex stopped by to support his fellow DJ.

A Kardashian And A Cheetah - Khloe Kardashian and Adrienne Bailon hung out together at the event.

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A Kardashian And A Cheetah - Khloe Kardashian and Adrienne Bailon hung out together at the event.

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Don't Be Cruel - It was definitely a night to remember as Bobby Brown performed at DJ Cassidy's party.

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Don't Be Cruel - It was definitely a night to remember as Bobby Brown performed at DJ Cassidy's party.

The Overweight Lover - From the old school to the new school, the one and only Heavy D was in the house.

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The Overweight Lover - From the old school to the new school, the one and only Heavy D was in the house.

Executive Swag - Warner Music Group's CEO Kevin Liles with BET's President of Music Programming Stephen Hill made their appearance.

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Executive Swag - Warner Music Group's CEO Kevin Liles with BET's President of Music Programming Stephen Hill made their appearance.

Rap Royalty - Cassidy's parties are always known for the legendary performances. This year, he brought Rakim back to the stage.

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Rap Royalty - Cassidy's parties are always known for the legendary performances. This year, he brought Rakim back to the stage.

McKnight At Night - As the party went well into the night, R&B singer O'neal McKnight also performed.

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McKnight At Night - As the party went well into the night, R&B singer O'neal McKnight also performed.

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Show Stoppers - DJ Cassidy gets on the mic with one of the best to ever do it, Doug E. Fresh.

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Show Stoppers - DJ Cassidy gets on the mic with one of the best to ever do it, Doug E. Fresh.

Nas: September 14 - Rapper Nas celebrates his 37th birthday.

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Illmatic - Nas partied the night away with old friends.

Good Times - DJ Cassidy has fun.

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Good Times - DJ Cassidy has fun.

Test - Test

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Test - Test