"Things are going well between us..." Mejia, 20, coyly told Radaronline.com.
"[Brown] has treated me like a gentleman at all times."
But reports that Mejia is Chris's new girlfriend are false, his rep tells Usmagazine.com.
Says the rep, "Chris left the recording studio with a songwriter named Dean. Natalie was with Dean. They went to a tattoo parlor. Dean was going to get a tattoo, but it was too busy so they left. Chris is not dating, nor is Natalie Chris' girlfriend."
What's up with Brown and Rihanna?
Sources tell Us that the on-and-off couple has cooled down. They still text, a source says, "but not as much."