Miley Cyrus has poked fun at false pregnancy rumours by posting a mocked up picture of herself undergoing an ultrasound baby scan.

The pop singer was recently hit with a slew of reports suggesting she was expecting a baby with her boyfriend, Arnold Schwarzenegger's son Patrick, and she has now made light of the untrue story by posting a shocking snap on her page.

The picture shows Cyrus' face superimposed onto the body of a pregnant woman undergoing a scan. The doctor's face features an image of her assistant, Cheyne Thomas, and the baby on the screen appears to be made from pizza.

Cyrus captioned the picture, "The rumours are true..."