Meghan Trainor said she "hated" giving away one of her songs to Jennifer Lopez.

The singer is a co-writer of the US star's new single 'Ain't Your Mama'.

Speaking to the Daily Star, Trainor said that she felt upset when she finally let go of the tune.

The 'No' star said: "As soon as I had time off with the last album I wrote straight away as that doesn’t feel like work.

"It’s so hard as I wrote so many songs I had to give them away, I hate letting songs go, 'Ain’t Your Mama' was one of them. I cried so much as it’s like my child.

"I texted Jennifer when shooting my video for No and she said: 'I love this song'."

However, Lopez has come under fire for working with Dr Luke as a producer on the record.

He has been embroiled in a legal battle recently with Kesha, who claims he raped her.

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Listen to 'Ain't Your Mama' below: