Before: Lady Gaga on MTV's Boiling Points in 2005.

After: Lady Gaga performing on stage just four years later.

Before: 57-year-old Paul Stanley out and about in Los Angeles in January 2009. A dead ringer for Vincent Shiavelli?!

After: The glammed up Paul Stanley in his element as lead singer of KISS

Before: David Daniel Snider before donning make-up and wig

After: The freaky as hell Dee Snider onstage with Twisted Sister

Before: The slightly geeky looking Brian Hugh Warner

After: Marilyn Manson as we know and love him

Before: The rotund, flabby and angry Boy George by the day (before he went to prison, that is)

After: The shamed pop star in typically garish attire

Before: Tommy Thayer with his wife Amber at a charity event in Los Angeles

After: The 48-year-old guitarist sporting his famous look with KISS in Italy

Before: The somewhat scruffy looking Angus Young stopping for a smoke in the street before a show in Toronto

After: How we know Angus best, resplendent in his school uniform on stage with rock legends AC/DC

Before: Corey Taylor still looking pretty damn scary without a mask as the Stone Sour singer

After: The masked Corey Taylor as we know him best fronting Slipknot.

Before: Eric Singer judging a talent competition in Hollywood, California

After: The 50-year-old drummer in his effeminate make-up with KISS

Before: The lady-loving, aesthetically challenged Chaim Witz

After: The Demon himself Gene Simmons with Kiss

Before: Relatively few photos exist of The Knife unmasked, except this 2003 promo shot where they jokingly parody gymnasts

After: The ultra secretive Karin and Olaf Dreijer as they prefer it - behind masks.

Before: James Root unmasked as the lead guitarist with Stone Sour, the band in which he plays alongside Corey Taylor

After: The damn scary looking James Root masked with Slipknot at London's Hammersmith Apollo in December 2008

Before: Photos of Daft Punk's Thomas Bangalter and Guy-Manuel de Homem-Christo without masks on are so rare, the only one we could get our hands on was this magazine cover from back in 1994.

After: Towards the end of the 1990s Thomas and Guy-Manuel turned into robots and have remained that way ever since.

Before: The affable looking Sid Wilson having a smoke in a rare unmasked interview

After: The robotic turntable wizard with Slipknot

Before: The golf-loving Chris Fehn as interviewed on the DVD Voliminal: Inside the Nine.

After: The pointy faced Slipknot percussionist

Before: The 6ft 4inches man mountain that is Mick Thomson unmasked

After: The formidable lead guitarist as he appears onstage with Slipknot

Before: Sean Crahan talking about life and the relationship between band members

After: Sean 'Clown' Crahan in a Slipknot promo shot from summer 2008

Before: A serious Joey Jordison in the DVD documentary

After: As we know and love him behind his revolving drum kit at London's Hammersmith Apollo