Chris Brown and his boo thang Karrueche Tran were spotted at the Sydney Kingsford-Smith Airport in Australia earlier today April 11.  Chris is set to perform at Supafest in Oz on Saturday. It’s also rumored that Rihanna was going to join her ex on stage to perform ‘Turn Up The Music’ together for the first time, as well as the controversial ‘Birthday Cake’ remix. Looks like that isn’t going to happen now.  Chris and Karrueche landed, while Rihanna, who was in town for the premiere of her film ‘Battleship,’ departs from Sydney Kingsford-Smith Airport.