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The final season of "Jersey Shore" starts tonight on MTV -- and boy how the lives of Snooki and Co. have changed since the show debuted in 2009.

Not only has the show experienced a cast shakeup, which saw Angelina Pivarnick get booted and eventually replaced with Deena Cortese in Season Three.

Since the reality show's premiere, the stars have gone through breakups and makeups, engagements and pregnancies, breakdowns and trips to rehab.

And they've all changed their looks while doing it ... losing weight, adding news tattoos to their inked up bodies and developing even more muscle mass.

Check out the gallery above to see how Snooki, The Situation, Jwoww, Deena, Pauly D, Ronnie and Sammi have all transformed since their TV debuts!

The sixth and final season of "Jersey Shore" premieres tonight.

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