Singer Celine Dion is struggling to write songs - insisting she is "too busy" to pen new material.The My Heart Will Go On hitmaker is currently embarking on a year long world tour that ends in February.

Britney Spears has delighted fans by announcing the dates of the North American leg of her upcoming world tour - and she plans to take in twenty different cities.The Womanizer hitmaker, who released new album Circus on her 27th birthday, last week announced her only two European dates in London for June.