Demi Lovato and Rachel Zoe wow at Kathy Hilton's extravagant family Christmas party with Kyle Richards

The annual Hilton family Christmas party took place on Friday night at Kathy Hilton's Los Angeles mansion.

Kathy's daughter Nicky Hilton and sister Kyle Richards joined in the festivities and all three wore dresses from Nicky's holiday dress collection for Australian designer Rebecca Vallance.

The Hilton relatives were joined at their spirited fete by Demi Lovato, Rachel Zoe and fashion designer Stacey Bendet. 

Demi, 32, looked fantastic in a form-fitting red and green print, long-sleeved, floor length gown.

She paired the festive look with black pumps and an updo with one tendril hanging down the side of her face.

Rachel, 53, looked like a snow princess in a white on white floor-length, shimmering gown that she paired with a white faux fur jacket. 

Kathy, 65, wore a short, sequined red minidress with five white bows down the bodice which she paired with red pumps.

Nicky looked lovely in a maroon sequin gown with a white bow and a small cutout on her torso.

Kyle, 55, wore a similar dress in black that had spaghetti straps. She paired the gown with black opera gloves.

Earlier this week, Kathy dished about the secrets to her 45-year marriage to Rick Hilton.

'I think just — respect,' the media personality said. 'And honesty. And if you’re upset about something, you talk about it right away,' she told Page Six.

Sharing another gem, Kathy pointed out the importance of being mindful of who they spend time with socially.

'Keeping the right influences, like, the right couples around,' she noted before emphasizing that 'a little mystery' is helpful.

The Real Housewives of Beverly Hills star also advised that couples should 'never go to bed upset.'

The mother-of-four has been with her husband since she was 15-years-old and he was 19.

They share Paris, 43, Nicky, 41, Barron, 35, and Conrad, 30.

Last month, Kathy also dished on whether her sister Kyle was ready to date again following her split from her husband Mauricio Umansky, 53. 

'I think she's just taking her time. We just wrapped a month ago, and so she's spending a lot of time with her girls,' Hilton opined to People, referencing their film at the Elizabeth Taylor Ball to End AIDS for RHOBH.

Kyle is mom to daughters Farrah, 36, Alexia, 28, Sophia, 24, and Portia, 16.

Reports of marital strife between Kyle and Mauricio in the summer of 2023, and she revealed the separation in July of that year.

Kathy also revealed that she and Mauricio still catch up occasionally, though their relationship isn't as strong as it was prior to his separation from Kyle.

'We're family. I want it all to be nice,' she said of the real estate agent. 'I have my nieces I love and adore and I like everybody to get along.'

Fans of Kathy were left with questions after the latest episode of RHOBH.

The episode picked up where last week left off, on their trip to Oceanside, where  Kyle shared something strange about Kathy.

'You know what was so funny? You guys will not even believe,' Kyle said to Sutton Stracke and Jennifer Tilly.

'My sister, she comes in, she goes, "Do you have an extra toothbrush?" I went in and she was brushing with her eyeshadow brush. Polish her teeth with the toothpaste,' Kyle said, as Sutton was stunned.

'Guys, I don't understand how we can be so different, and yet we're blood,' Kyle added of her sister, as they showed flashback footage from a day earlier of Kathy actually brushing her teeth with an eyeshadow brush.