Paris Hilton's wedding planner says one of the most challenging parts of the event was getting guests to give up their phones

• Paris Hilton and Carter Reum got married on November 11.
• They wanted a phoneless wedding and asked guests to give up their devices as they arrived.

Paris Hilton got married last month, saying "I do" to Carter Reum on November 11 at her grandfather's former home.

The couple, both 40, planned a three-day wedding celebration, and it featured everything from a carnival party to performances by her famous friends, including Demi Lovato.

The massive celebration presented many logistical challenges, with the planning staff beginning preparations a week in advance, the couple's planner, Mindy Weiss, told Insider.

But Weiss said one of the most difficult aspects of the wedding day came from a surprising source: guests' phones.

Weiss told Insider Hilton and Reum wanted a phone-free wedding, in part to ensure guests weren't taking photos of the event.

But many guests didn't want to give up their phones.

She said she didn't think that guests wanted to take or release photos from the event but that they just didn't want to be separated from their devices.

"When they say, 'We won't take pictures,' we know that," Weiss said. "But the bride and groom wanted to collect it."

Weiss said creating a seating chart for Hilton and Reum's wedding was also challenging, in part because so many of their guests were famous.

Stars like Kim Kardashian West, Kate Beckinsale, and Jaden Smith attended the affair. Weiss had to figure out where to seat not only the stars but also everyone else in Hilton and Reum's life.

For instance, Hilton's parents, Kathy and Richard Hilton, had family friends attending the event, whom Weiss also had to seat.

Kathy Hilton said on "Paris in Love," the Peacock documentary about Hilton's wedding-planning process, that she planned to invite 75 of her friends to her daughter's nuptials.

While there were challenges, Weiss said that the wedding was a success — and that Paris Hilton was a "sweet" bride.

"She's very nice," Weiss said. "She's a very, very sweet person."