The pals were photographed at Neon Carnival, an event near the annual desert music festival presented by Levi’s Brand and RE/DONE Levi’s with Tequila Don Julio in Thermal, California.
The pop star, 28, and recent Oscar winner, 41, tried to keep their appearance low-key, with her sporting a pair of stunner shades and him aviators with a baseball cap.
A source tells PEOPLE that the pair didn’t appear romantic when they met up at the party.
“Leo slipped into the party incognito and was dancing and singing to ‘No Scrubs,’ ” the source said. “He knew every word! A couple tables over Rihanna was dancing with a couple girlfriends. Leo saw her and made his way over to say Hi.”
While reports over the past couple years have intimated the pair has casually dated in the past, neither has ever commented on the status of their relationship.
Last year, DiCaprio was spotted getting flirty with Rihanna when he helped her ring in her 27th birthday in New York. Then, in January, they met up at a Paris club together – but at the time, sources told PEOPLE the two are “just friends.”
Their latest outing at Coachella comes as Rihanna is in between tour dates on her Anti World Tour. She’s due back on the road Monday, when she’ll perform in Winnipeg, Canada.
• Reporting by MELODY CHIU