SUGABABES star Keisha Buchanan has been romantically linked to Brandy's singer brother Ray J. The ROUND ROUND hitmaker, 21, recently split from on/off boyfriend Zane Alliluyeva, and has been seen on a series of dates with the American R+B star this month (MAR06). On Tuesday (07MAR06), the couple enjoyed a meal at Robert De Niro's London eaterie Nobu, before partying at trendy nightspot Funky Buddha.