'Shine Ya Light' singer Rita, who is currently dating DJ Calvin Harris, was quizzed about the rumours by Andy Cohen on his US chat show Watch What Happens Live on Monday night (28 April).
Rumours about Rita and Nick surfaced last year, after Nick wrote a Jonas Brothers song in September titled 'What Do I Mean To You', which refers to a girl called Rita who had treated him badly.
Lyrics to the song include: "No need for water Rita, you got the wine. Searching for diamonds, when I gave you the time. Keys to an open door, don't need a lock. Stains on a dirty floor, you don't see a spot."
While the song name checks a Rita, the 23-year-old claims that she has never been in a relationship with Nick, who is currently dating former Miss Universe Olivia Culpo.
"I never dated him," said Rita. "I actually met Nick through a friend and it was a very weird situation because we were close, but it never went to that level and then I read the lyric and I kind of messaged him and was like, 'I have no idea where this came from. If you want to talk about it, call me'."
"He was like, 'You know what, I just obviously didn't put out how I felt across to you properly'," she continued. "And it was one of those situations."
Rita added: "He never really told me that I think, but regardless we're still friends and I still have a lot of respect for him."
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Watch Rita's music video for 'Radioactive' below: