Meghan Trainor is ''single''.

The 21-year-old singer sparked speculation she is dating her 'Marvin Gaye' collaborator Charlie Puth when they locked lips during their rendition of the song at the American Music Awards, but she's since taken to Instagram to rubbish the claims.

Alongside a picture of the kiss, she wrote: ''All about dat ass grab doe @charlieputh proud of you Charlie #imsingle. (sic)''

Charlie had told People magazine to expect ''a lot of making out'' when he and Meghan took to the stage ahead of their performance.

And he also insisted he and the 'All About That Bass' singer were just ''friends'' while speaking backstage.

He said: ''There was a lot of making out. The dancers were making out and I'm sure some of the other dancers were making out. I think that's it though.

''We're friends and it's all part of my whole vision when I made 'Marvin Gaye,' for people to hear the record and spontaneously make out with each other.

''That was the goal tonight for the live show.''