NEW YORK: Drake has banned Rihanna from speaking to her ex-boyfriend Chris Brown.  The 'Hold On, We're Going Home' rapper has reportedly told his beau he'll only make their relationship official if she agrees to cut all ties with the 24-year-old singer.  A source told the Daily Star newspaper: ''Rihanna and Drake are just having fun at the moment. Neither of them are relationship people really. But Drake has made it clear that if things are going to get serious with them, he doesn't want her speaking with Chris.  ''They are never going to get along properly.''  Despite their turbulent past, Rihanna, 26 kept somecontact with Chris.–EN