Kim Richards and Kyle Richards have had an up-and-down relationship for years, but currently, they appear to be on very good terms.

'RHOBH' Kyle Richards On Drama With Kim & People's Perspective Of Faye Resnick

On Tuesday night, ahead of Kim's return to The Real Housewives of Beverly Hills season six, the sometimes-troubled reality star shared an emotional message on Instagram, and told Kyle she loved her.

"What a special day today... Happy Birthday to Our Little Portia... Who's brought so much love & happiness to our whole family!! I love you.. Your sweet , beautiful face & Your hugs!!!" Kim wrote, also adding, "Happy Labor Day to My Sister @kylerichards18 I love you both so much !"

Did Brandi Glanville Lie About Kyle Richards Skipping Monty Brinson's Funeral? Kathy Hilton Speaks

During Kim's return to The Real Housewives of Beverly Hills last night, she and Kyle had a heartfelt chat with one another, in which Kyle asked Kim why her friend Brandi Glanville always has to tweet or post photos when they are together. Although Kim rarely posts about Brandi, she's sure to make fans aware of their time together, and just days ago posted a photo of Kim with her son. Meanwhile, Kim's latest photos show nothing but images of her family.

For more of Kim and Kyle Richards, tune into The Real Housewives of Beverly Hills season six, airing on Tuesdays at 9 p.m. on Bravo.

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