Nicky Hilton tied the knot with James Rothschild in July, but according to a new sneak peek of The Real Housewives of Beverly Hills, the ceremony may have been missing a family member.

Kim Richards MIA During Nicky Hilton's Bridal Shower

In the recently released preview of the upcoming episode, which airs on Tuesday, Kyle Richards is seen talking to Lisa Vanderpump, revealing that while she was previously planning to attend her niece's wedding, she had since been told it would be better if she didn't.

"Family dynamics can be very complicated, and my family is no exception," Richards explained during a confessional. "I've always been very close with all of my nieces and nephews, but somewhere along the line, something happened where I was told it would be a better idea if I didn't come."

Kathy Hilton Loses Touch With Kyle Richards, Denies 'RHOBH' Rumors?

Prior to Hilton's wedding, Richards had attended the bridal shower of her niece, along with her older half-sister, Kathy Hilton. Meanwhile, her sister Kim was noticably absent.

"I don't even know how to describe, nor do I want to describe, the relationship between my sisters and me," Richards continued. "Obviously, this isn't something that makes me feel good, but it's Nicky's day, and my sister Kathy's day as the mother of the bride. So, I have to respect their decisions."

While Richards doesn't appear to have been a part of the bridal party, she does seem to have attended Hilton's wedding, as she shared a photo of her daughter during the bash.

For more of Kyle Richards and her family, tune into The Real Housewives of Beverly Hills season six on Tuesday at 9 p.m. on Bravo.