R+B singer Chris Brown has dismissed reports he is dating UMBRELLA hitmaker Rihanna, insisting he is "definitely single". Brown, 18, and the 20-year-old Bajan beauty have been linked for months, but both stars have continually denied rumours they are romantically involved, despite the couple being snapped frolicking in a swimming pool while on vacation in Jamaica last month (Feb08). And Brown claims he has even been receiving threats from his female fans accusing him of lying about his relationship with Rihanna. He tells MTV.co.uk, "(From) a relationship standpoint I am a single guy, I am definitely single. "I've been on my website and seeing how girls have been threatening me and saying I'm a liar and I'm like it's not even that." However, the Run It star does admit to having a "close" pal: "I have a close friend but it's not like a relationship, I'm not trying to settle down, I'm only 18 so I'm just trying to live my life and have fun."