Carter Reum couldn’t hold back tears as his bride, Paris Hilton, walked down the aisle during their lavish Bel-Air wedding.

“There were tears. I saw Carter shed a few tears when he was watching Paris coming down the aisle with Rick,” a guest at Thursday’s wedding told Page Six.

Paris’s father, Rick, walked her mom, Kathy, down the aisle before giving away his daughter to Reum.

Before Hilton could even say, “I do,” Reum was trying to steal kisses, the source said.

“It was a beautiful wedding. Carter kept trying to kiss her through the ceremony, and they kept saying, ‘Not yet, not yet,’” the source said.

Hilton’s pal Demi Lovato serenaded the couple with a “great rendition” of “I Will Always Love You.”

“Demi did an amazing job. It was unbelievable. [they] sounded so beautiful,” the source dished.

Lovato wasn’t the only celebrity guest that performed on this special evening. Paula Abdul and Kim Petras grabbed mics, while Reum also did a few dance moves.

The wedding took place at Paris’ late grandfather Barron’s California estate, and the tent was decorated with oversized white flowers.

“The couple said their vows under an arch of beautiful white roses. It was beautiful, and they wrote their own vows,” said one source.

The guest told us, “The wedding was very touching and very sweet. Paris looked stunning in her dress; it was truly angelic.

“There were lots of beautiful young flower girls and page boys scattering rose petals.

“And her sister, Nicky, who was maid of honor, looked regal and sophisticated.”

It didn’t appear to be “overly star-studded,” said the source, but pals Abdul, Emma Roberts, Bebe Rexha and Kim Kardashian all attended.

Kardashian did not bring her rumored new love interest, “Saturday Night Live” star Pete Davidson. Instead, the Skims founder was there with Kimora Lee Simmons, we’re told.

From the social set, guests included Alice + Olivia designer Stacey Bendet, Somers Farkas, Elliot Mintz, Nikki Haskell, designer Dennis Basso and author Jay McInerney — whose wife, Ann Hearst, could not attend.

There was also Princess Olympia of Greece and Marie Chantal.

“They all really pulled it together and looked great. People you never see in Los Angeles came in for this wedding … a lot of New Yorkers,” the source said.

Casino magnate Steve Wynn also gave a “very touching speech” about how thrilled he was to be at the wedding.

Cameras were forbidden with the exception of Peacock’s crew filming for Hilton’s new docuseries, “Paris in Love,” which premiered the same day as the wedding.

“There were cameras hanging from trees, so many cameras! You couldn’t put a bite of food in your mouth without cameras looking down on you,” the source said.

The second source added, “For a show being filmed, it clearly felt like a family event. It wasn’t a big crowd, there were only around 200 people.

“After the ceremony, there was a seated dinner, a special ravioli and salad, the entree was fish or slices of beef, and the tables were filled with white and pale pink peonies and roses.

“Paris’ father, Rick, made a very touching speech and toast.”

All guests were gifted a pair of Baccarat votive holders on the way out, along with two bottles of cologne, in bottles designed like a bride and groom marked “The Paris Hilton Wedding Collection.”

The reception was catered by Spago and included “tons of caviar.” The three-night-event continues on Friday with a carnival-themed bash at Santa Monica Pier.

In April 2020, Reum and the heiress confirmed their love. They then got married in February. Jean Dousset, a venture capitalist proposed to Reum with an emerald cut diamond ring.