Two One Direction stars - Liam Payne and Harry Styles, have reportedly become concerned that they may have chlamydia after coming in contact with a koala in Australia.

Up to 80 per cent of koalas in Australia are infected with the STI. The singers were told they could be carrying it after holding 3-year-old Kat.

Payne told The Sun: "I'm genuinely scared. This is worrying. I'd have never picked the thing up if I'd known."

The spread of chlamydia among koalas is a major threat to the future of the species, although transmission to humans is unlikely.