Photos Inside Paris Hilton's Wedding to Carter Reum, Dancing, Kim K and More!

Paris Hilton is a married woman -- walking down the aisle and saying her "I Do's" -- with Carter Reum in a celeb-studded ceremony ... with plenty more wedding celebrations to come!

Hilton and Reum tied the knot Thursday night at Paris' late grandfather's sprawling Bel-Air estate. Paris looked stunning in an Oscar de la Renta wedding gown, and the setup was immaculate with thousands of white roses lining the aisles and a white rose arch over the couple as they exchanged vows.

Paris' sister, Nicky, served as maid of honor while Tessa Hilton, Halle Reum, Brooke Brinson, Whitney Davis and Farrah Aldjufrie were her bridesmaids. One of Paris' longtime friends, Kim Kardashian, was in attendance and helped Paris get her dress situated. Nicole Richie, who starred in "The Simple Life" with Paris was also there.

After the serious stuff, the guests were treated to a performance by Demi Lovato. BTW ... in true Paris fashion, she had 4 outfit changes throughout the night.

Speaking of over-the-top, so was the guest list, which included Paula Abdul, Kyle Richards, Bebe Rexha, Emma Roberts, Evan Ross and a ton more.

The ceremony kicks off a weekend-long worth of festivities, including a carnival-themed party at The Santa Monica Pier Friday, followed by a black and white tie event on Saturday ... so ya, there's a lot still to come.

The newlyweds got engaged on a trip to a private island to celebrate Paris' 40th back in February, but dated for quite sometime before that.

Reum marked Hilton's 4th engagement ... she never made it to the altar with any of the previous dudes -- who included actor Chris Zylka.

Of course, in true Paris fashion, the whole shindig will be profiled on an upcoming documentary.