LONDON - Pop star Britney Spears has reportedly received death threats while on her current Circus tour.

Contactmusic.com reported that Spears has attracted the unwanted attention of a dangerous stalker.

‘Britney received some anonymous death threats over the phone and in the mail, and her worst fear is a kidnap plot against (her sons) Sean or Jayden. She’s been having terrible nightmares since then and she wakes up in the middle of the night crying for her boys,’ said a source.