Keith Lemon was left dumbfounded as Lily Allen told him all about her third nipple in great detail.

The Smile star revealed the shocking news on Thursday’s edition of Shopping With Keith Lemon.

As she talked with the comic host in a teaser for his ITV2 programme, the British singer, 34, frankly said that her extra nipple ‘gets erect’ and ‘lactates’ at times.

‘Where’s your third nipple?’ Keith inquired. Lily indicated that it was under her left breast’s nipple.

‘Is it just a mole?’ he said, interrogating her further.

‘No, it’s a real thing,’ Lily stated emphatically. ‘Yeah, it actually gets erect when you stroke it.’

‘Yeah, and it actually lactates,’ Lily said.

Lily said when asked about showing off her uncommon bodily feature, “I’m not going to show you.”

‘No, I wasn’t going to ask,’ Keith said, ‘I don’t know you well enough.’

She also revealed to the comic that she didn’t have her first orgasm until she was in her twenties, and that “I don’t think a lot of women are having orgasms. A lot of women fake the orgasm. You might really really like someone and you might have been with them for weeks and then you think, ‘Oh my God, this isn’t going to work. But if I tell him it’s because he’s not doing it for me then what’s his reaction going to be?’”

Lily has recently been unusually open about her tumultuous career, admitting that she’s ‘surprised she’s not dead’ owing to her wild partying habits.

‘I’m surprised I’m not dead,’ she told The Guardian. ‘The music industry was a hedonistic place in the noughties. People who indulge don’t generally come out the other side. Having children triggered responsibilities.’