Lily Allen has expressed her frustration after Jourdan Dunn questioned her lyrics on Twitter.

The model took to the social networking website to ask Allen what she meant by the lyrics in the song 'Insincerely Yours'.

One section reads: "I don't give a f**k about Delevingne/Or that Rita girl/About Jourdan Dunn/I don't wanna know about your perfect life/Your perfect wife and it makes me sick/I don't give a f**k about your Instagram/About your lovely house or your ugly kids."

Dunn, who has one child, tweeted: "Errm @lilyallen who's 'ugly kids' was you talking about in this song??"

Allen, referring to a fall out with Azealia Banks, replied: "@missjourdandunn it's a reference to something another artist said about my children on twitter. Also, only mentioned you cause your name rhymes with 'one'. Sorry."

Dunn added: "@lilyallen Ohhh because my name rhymes with 'One'!!!!! Look at you, you lil lyrical genius!!"

The 'Sheezus' star then expressed her frustration at the episode, saying: "I'm sick of explaining my lyrics to people, they're pop songs, no more, no less. If you don't get it or like it, look the other way. Simples."