Selena Gomez's death threats

Selena Gomez has been getting death threats from Justin Bieber fans.

She's had a string of nasty messages from 'Beliebers' on Twitter, ever since she was pictured kissing him on holiday in the Caribbean.

One said: "Roses are red, violets are blue, @selenagomez if you'll break @justinbieber's heart I'm gonna kill you. [sic]"

Justin, 16, and Selena, 18, have both denied they are dating.

Meanwhile Bieber has told Vanity Fair magazine that he sometimes suffers from insomnia, as his mind races at night.