Charlie Puth and Meghan Trainor are NOT dating!

Los Angeles - Charlie Puth insists he and Meghan Trainor are just "friends".

The two stars turned heads at Sunday night's American Music Awards (AMAs) when they shared a lengthy kiss at the end of their performance of Marvin Gaye but the 23-year-old singer claims they were just keeping in with the theme of the song.

Speaking backstage, Charlie 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."

And All About That Bass hitmaker Meghan took to Instagram to reassure her fans she is "single".

She posted alongside a picture of the kiss: "All about dat ass grab doe @charlieputh proud of you Charlie #imsingle. (sic)"

All about dat ass grab doe @charlieputh proud of you Charlie ?? #imsingle

A photo posted by Meghan Trainor (@meghan_trainor) on

Ahead of their performance, Charlie had told People magazine on the red carpet at Los Angeles' Microsoft Theatre to expect ''a lot of making out'' when they took to the stage.

(Photo: AP Photos)