CBB's Katie Hopkins pictured in original Big Brother pilot in 2000
In pictures obtained by the Daily Star, a rather young looking Katie can be seen swigging from a bottle of Strongbow cider and flashing her bare bottom while recording the trial programme.
The dummy series never made it to air, however TV bosses were impressed with the format and launched the popular show on Channel 4 later that year.
Back then, it was hosted by Davina McCall and builder Craig Phillips was crowned the first ever winner. He later donated his £70,000 prize to his friend Joanne Harris, who suffered from Down's Syndrome.
Meanwhile, in tonight's episode of Celebrity Big Brother, Katie will be seen clashing with Perez Hilton following Ken Morley's removal from the reality show.
Katie blames US blogger Perez for his exit before branding him a "raving lunatic" when chatting to her fellow housemates.