*A rep for Chris Brown has dismissed reports he’s teaming up with ex-girlfriend Rihanna for a performance at Australia’s Supafest.

Rihanna stunned fans in February when she teamed up with Brown, who was instructed to stay away from her following an assault charge in 2009, to record two remixes.

Rumors have since been circulating that the stars are planning a surprise collaboration at Australia’s biggest urban concert event, the Supafest Music Festival, in Brisbane next month but Brown’s rep tells GossipCop.com the speculation is “not true.”