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. Judging by the pics, no detail was spared, and the entire setting was immaculate.

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 Zilka.

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