The former X Factor judge teamed her newly-black hair with an all-black outfit to pose for a couple of pictures with Rio at a bar over the weekend.
Tulisa, 25, didn't indicate whether she and Rio are friends or just randomly bumped into each other at The Milton Club. She did, however, admit it wasn't a big night for her as she called it quits early to head home.
"Sick night in manny with @rioferdy5 had 2 retire early though was proper slacking last night #lightweight LOL (sic)," she wrote next to one picture.
Or was it because she drank a bit too much champagne? Tulisa uploaded a second picture of Rio staring at her quizzically adding the joke caption: "Did u just neck that champs?.......well eeeeeeeeeeerrrrrrrrrrrrrmmmm."
Tulisa dyed her hair black earlier this month, just days after showing off newly-applied blonde hair extensions at court.
The N-Dubz singer appeared at Southwark Crown Court on 9 January for a preliminary hearing in relation to her drugs charge trial. She has denied being involved in the supply of drugs.
Tulisa was arrested in June 2013 after a newspaper undercover investigation claimed she'd offered to introduce a reporter to a drug supplier. She has denied this.
The trial begins 14 July 2014, the day after her 26th birthday.