Los Angeles, California – Paris Hilton is set to marry her fiancé Carter Reum on Thursday, but the heiress seems to be making some pretty crucial changes of plan as the big day approaches.

Paris and Carter have changed the location of their wedding ceremony just days before her wedding.

"Originally, they were going to get married in the church, but they switched it about a week or so ago," an invited guest told Page Six.

Now the huge bash is set to take place at Paris' late grandfather Barron Hilton's estate in Bel Air.

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There are reportedly three nights of celebrations planned, including a carnival at Santa Monica Pier on Friday and a black-tie affair on Saturday.

But the location isn't the only big decision left to the last minute. Though she has said she plans to don 10 different gowns throughout the festivities, Paris is apparently still deciding what to wear when she walks down the aisle.

Sources say she's torn between a Valentino and an Oscar de La Renta dress.

The bridesmaids are expected to wear matching pink outfits designed by Alice + Olivia.

Earlier this month, Paris celebrated her upcoming wedding with an Alice in Wonderland-themed bridal shower.