Demi Moore

Original "Jersey Shore" Name: D-Boogie

Replaced In The Cast By: The Situation

Reason For Replacement: Unfortunately for Demi/D-Boogie, MTV was committed to only having one 40-year-old in the main cast, a job that had already been promised to Mike "The Situation" Sorrentino, who is 45. Luckily for Demi, however, the ensuing free time allowed her to meet, fall in love with, and marry child prodigy Ashton Kutcher, with whom she has been delightfully happy ever since.