Paris Hilton is about to become a married woman … and tons of celebs are on hand to witness her nuptials.

Paris and her soon-to-be hubby, entrepreneur Carter Reum, are tying the knot Thursday at her late grandfather Barron’s Bel-Air estate, where the guest arrivals are in full swing … and we’ve got the pics of her star-studded guest list.

Check out the gallery … folks like Paula Abdul, Kyle Richards, Bebe Rexha, Emma Roberts and Evan Ross are in the house … with more expected to arrive.

The wedding guests, including longtime friend Kim Kardashian, are soaking in the ceremony at the $60 million estate, where ya can’t miss the hot pink and white floral arrangements with the bride and groom’s initials.

The ceremony is the first part of Paris’ three-day wedding … next up is a Friday night carnival on the Santa Monica Pier, and the celebration wraps up Saturday with a black-tie event.

Remember … Paris and Carter got engaged back in February, when he popped the question on a private island to kick off her 40th birthday celebration.

The fourth engagement was the charm for Paris … her previous fiancés never made it to the big day. She was engaged to Jason Shaw in 2002, Greek shipping heir Paris Kassidokostas-Latsis in 2005 and actor Chris Zylka in 2018.

Ever the reality TV star, Paris documented the behind-the-scenes of her wedding planning for her new reality show on Peacock, “Paris in Love.”

There could be another important milestone in the near future for Paris and Carter … they have been undergoing in-vitro fertilization treatments leading up to the wedding … so stay tuned for a potential pregnancy.