Chris Brown Parties with Ex-Girlfriend Karrueche Tran at Birthday Celebration at 1 OAK Nightclub

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Chris Brown at 1 OAK Nightclub
Chris Brown
arrived at his birthday celebration at 1 OAK Nightclub at the Mirage Hotel and Casino on May 4, 2013 in Las Vegas, Nevada (Photo credit: Denise Truscello / WireImage www.DeniseTruscello.net)

Chris Brown was with his ex-girlfriend Karrueche Tran.  Also seen on the red carpet was Fabolous.

Chris Brown with his ex-girlfriend Karrueche Tran at 1 OAK Nightclub
Chris Brown with his ex-girlfriend Karrueche Tran at 1 OAK Nightclub

Photo credit: Denise Truscello / WireImage www.DeniseTruscello.net.

Chris Brown with his ex-girlfriend Karrueche Tran at 1 OAK Nightclub
Chris Brown with his ex-girlfriend Karrueche Tran at 1 OAK Nightclub

Photo credit: Denise Truscello / WireImage www.DeniseTruscello.net.

Chris Brown with his ex-girlfriend Karrueche Tran at 1 OAK Nightclub
Chris Brown with his ex-girlfriend Karrueche Tran at 1 OAK Nightclub

Photo credit: Denise Truscello / WireImage www.DeniseTruscello.net.

Chris Brown at 1 OAK Nightclub
Chris Brown at 1 OAK Nightclub

Photo credit: Denise Truscello / WireImage www.DeniseTruscello.net.

Fabolous at 1 OAK Nightclub
Fabolous at 1 OAK Nightclub

Photo credit: Denise Truscello / WireImage www.DeniseTruscello.net.