The two US R&B singers spent time together at Coachella last weekend, before going out on for a secret dinner in New York.

"They had a really good time together last weekend and wanted to see each other again somewhere private straight after," a source told The Sun.

"They've known each other for a long time but it's always been bad timing. They've had a few long, passionate kisses. There's definitely a spark between them. "

A source added: "It would have been too obvious to go somewhere in LA and they were both going back to New York for work commitments."

(by Jason Gregory)