Jennifer Lopez has quashed reports that she used IVF treatment to conceive her twin newborns Max and Emme, insisting that it took her years to get pregnant naturally.

The Latino singer and her husband Marc Anthony were at the centre of debate with rumours citing she used artificial insemination to conceive, but J-Lo has denied the accusations.

She explains to People magazine: "It was natural. We didn't do in vitro, which I know was reported.

"Everybody assumed that because we had twins. I wanted to have a baby, but I've always said exactly what I said all those years they (reporters) asked us since we've been married: 'Well, when are you guys gonna have some kids?' 'When it happens naturally, I guess!'

"And that's when it happened. It was a surprise to us."

The 38-year old also admits she often doubted whether she'd ever become a first-time mum.

She adds: "You start getting older, you think to yourself, 'Maybe (having kids) is just not meant for me.'

"I knew there was nothing wrong with me. I knew that I could. Deep down, I really wanted it badly... (But) after one year, two years, three years... You know, you start thinking to yourself, 'Well, maybe...'"