The 'Toxic' singer - who is said to have lost her virginity to Justin - is desperate to rekindle her romance with the 'Sexy Back' singer since filing for divorce from Kevin Federline.

Britney's hopes have been raised since Justin split from his long-term lover Cameron Diaz.

A source says: "Britney would love to have Justin back. They still talk a lot and she's been telling friends for months about how good Justin was for her."

It has also been alleged that Britney, 25, started dating model Isaac Cohen in attempt to make Justin jealous.

The source added: "Britney gets an ego boost by parading her piece of eye candy around!