Kyle Richards sent a sweet message to her sister Kim on Instagram last week.

Kyle Richards Firing Back At Brandi Glanville For Making Up Lies During Reunion

As she celebrated National Siblings Day, the Real Housewives of Beverly Hills star shared a photo of herself, Kim and their older sister, Kathy Hilton.

"#NationalSiblingsDay these are my siblings @kathyhilton & @kimrichards11," Kyle wrote in the caption of the sisters photo on Saturday. "#Sisters no matter what," she added, seemingly in a nod to their ongoing feud.

Kyle Richards Claims Her Drama With Kim Would Be Happening WIth Or Without 'RHOBH'

Throughout the fifth season of The Real Housewives of Beverly Hills, Kim and Kyle feuded on and off. Early on in the season, Kim admitted to taking a pain killer that had not been prescribed to her, which immediately concerned Kyle. She was then told by friend and co-star, Brandi Glanville, that she should distance herself from Kyle because she doesn't respect her.

Towards the end of the season, Kim and Kyle's feud got even more tense after Kim alleged Kyle had stolen her stake in their deceased mother's Palm Springs, Calif. home. While Kyle claimed to have bought both her and Hilton out of their stakes and sold the home, Kim insists she was robbed of her part.

For more Kyle Richards tune into the third part of The Real Housewives of Beverly Hills, airing on Tuesday night at 8 p.m. on Bravo. Below is a sneak peek at tomorrow night's episode, which features Kim and Kyle.

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Bravo, Reality TV, The Real Housewives of Beverly Hills, Kyle richards, Kim Richards, Kathy hilton