The pop world has been generally inhabited by those of a more controversial and non-conformist persuasion. But even within the realms of the expected rock'n'roll behaviour, some stars have certainly been more shocking than others. Here's our top ten and why...

10. Ozzy Osbourne

As a former friend of Satan, he developed a penchant for biting the heads off live birds (bats and doves mostly) but perhaps most shocking is that he has married to stay married to Sharon for the past 25 years.

9. Elvis

Invented rock'n'roll, had it all, ate most of it, buried his parents in the back garden and then died on the toilet with a burger in his mouth...unless you read the Daily Sport newspaper in which case he's stacking shelves in a supermarket near you, right NOW!

8. Lady Gaga

Rumoured to be a hermaphrodite after pictures revealed what looked like male genitalia under her dress at a UK show. Obsessed with monsters and playgirls and likes wearing suits made from bubbles (not Michael Jackson's bubbles...)

7. David Bowie

Launched his career by posing as an androgynous supernatural Martian and then allegedly had an affair with Mick Jagger. But if you think that's bad, you should check out Tin Machine...

6. Keith Moon

The man loved his drink, loved his drugs, would regularly pack explosives into his drum kit and blow himself up during Who concerts. Famously drove a Rolls Royce into a swimming pool...as you do.

5. Prince

The diminutive purple one changed his name to an unpronounceable symbol and spent a not insignificant amount of time walking around with the word "Slave" etched on his cheek. Voted the World's Sexiest Vegetarian in 2006.

4. Michael Jackson

He said it didn't really matter if you were black or white, which was why he tried both and ended up grey. His best friend was a chimp called Bubbles and he also dangled his baby son out of a three storey hotel room.

3. Britney Spears

The bubblegum queen of pop had the world at her feet, but then she got it on with Madge on TV, married into trailer trash - twice - and shaved her head. Has never quite been the same since.

2. Madonna

She knows that scandal equals sales, hence the constant run-ins with the Catholic Church, not to mention her book Sex, the scene with the bottle in her 1990 tour documentary Truth or Dare, randomly trying to adopt African children, and of course for snogging....

1. Keith Richards

We all know about the Rolling Stones guitarist's voracious appetite for chemicals but snorting his own father's ashes surely puts him in a league of his own.