Denise Truscello, WireImage
As reported by an eye witness at Naya's big birthday bash at 1 OAK nightclub at the Mirage Resort Hotel and Casino, the 'Glee' hottie spent the whole night with her arms wrapped around one of the hit musical show's writers, Matthew Hodgson.
"They were dancing and kissing at her booth. You could clearly spot them making out," a Radar Online eyewitness reported.
"They hung together all night and really looked like they were having a good time, there's definitely something more than co-workers or just friends going on," a Perez Hilton source added.
Apparently Rivera has no problem mixing business with pleasure. She has previously been linked to two of her 'Glee' co-stars -- both Mark Salling, who plays Puck, and Chord Overstreet aka "Tourty Mouth" Sam.