The R&B singer, 19, was photographed with Mejia, 20, and another man on Saturday at West Hollywood tattoo parlor Tattoo Mania, where Brown has been inked before, a source tells PEOPLE.
"Chris was in a Hollywood tattoo parlor with a woman from the recording studio named Dean, who was getting a tattoo. (Chris did not get a tattoo)," Brown's rep tells PEOPLE.
"Natalie Mejia was there with Dean. [Reports in other media] that Natalie Mejia is Chris's new girlfriend are also false," says the rep, adding that other rumors claiming Brown is dating a Virginia college student named Erica Jackson are also not true.
So what about Brown and Rihanna, 21? Although the pair decided to take some time apart last month, a source tells PEOPLE that the singers spent time hanging out together over Easter weekend.
No New Tattoo for BrownA source at Tattoo Mania confirms that Brown has been tattooed there several times before, but did not plan to get a new tattoo Saturday. Brown and his party were asked to return later in the day because the shop was busy, but they didn't come back.
A source close to Mejia also says she and Brown aren't dating. "They met recently. They're friends. That's it," the source tells PEOPLE.
On Saturday night, Brown met up with celeb pals Tyrese Gibson, Omarion and Dream Girls actor Keith Robinson at Lucky Strike Lanes & Lounge L.A. Live for food and drinks.
Meanwhile, Rihanna was spotted visiting a Santa Monica recording studio on Friday.
Additional reporting by PERNILLA CEDENHEIM, JENNIFER GARCIA, JESSICA HERNDON and ELIZABETH LEONARD