Transformation ! Bikini-clad Kim,Kourtney and Khloe Kardashian before the fame

Kim Kardashian shared throwback  photos taken while filming season one of KUWTK..She wrote

'It's still so hard to believe we're on our 12th season of "Keeping Up With the Kardashians"!!!We went to Mexico for a swimwear shoot while we were filming season one and had a blast. We look like babies here LOL.'

The first season of the hit reality show kicked off in October 2007..