Meghan Trainor's duet with Harry Styles is about heartbreak.
The pair met up last year to write the song together, and the 'All About That Bass' hitmaker has now revealed it is inspired by unrequited love following a break-up
She explained: "It's a cute ukekele song with two vocalists, a male and a female, we don't know who yet.
"It's about how, you know when you date someone, and then you break up, and then you see them on a date with someone else but they're so happy, so you're like, 'I'm happy for you. Maybe some day in the future if we're back together, that'd be cool. Good luck. I haven't seen that smile in a long time, that's great. Maybe some day when we're old and gray, we could be in love once more.' Oops, there's a line!"
Although she wrote the love song with the One Direction hunk, the 21-year-old chart-topper shut down rumours the pair are dating, stating they have only ever spent a couple of hours together.
Speaking on Capital FM radio station - where she announced the Capital Breakfast Show will broadcast live from the 57th Annual Grammy Awards next week - she said: "Do you know how many hours I've spent with that man? Maybe two or three. And they're all like 'are you dating?' and I'm like, 'What? No!'
"The most I got was a hug, it was great. What a hug it was!"
The Capital Breakfast Show with Three will be Live from Los Angeles from Monday 2nd February.