Chris Brown is planning a huge birthday bash in Las Vegas on Saturday night (04.05.13).The 'Fine China' singer - who is set to turn 24 on Sunday - is cashing in on the occasion and has inked a lucrative deal with 1 Oak nightclub to celebrate with his friends there.A source close to the R&B star told HollywoodLife.com: "He's about to do his birthday in style, getting turned up and hitting up some clubs."It's a business thing for him, the clubbing. He getting paid."He'll be in Vegas getting crazy and having fun with the homies and just doing him. Chris likes to be the center of everything, so expect him to grab the mic and freestylin."The singer, who is planning a champagne-filled bash, is also trying to convince his on/off girlfriend Rihanna, 25 - who is currently on her 'Diamonds World Tour' - to join him for the night after she was forced to postpone her concert in Brooklyn, New York on Sunday because the Brooklyn Nets need the venue to compete in the playoffs.The insider said: "That's his number one and he wishes she could be with him on his birthday just like he was with her."But that's just how it goes sometime. They can't be together every second."