The cast of the “Real Housewives of Beverly Hills” penned sweet notes to their co-star and friend, Kyle Richards.

Richards turned 53 on January 11.

Lisa Rinna wrote: “HAPPY BIRTHDAY @kylerichards18 ✨✨You are hilarious , we love you so much! Hope this year brings you everything your heart desires!”

Kathy Hilton wrote in her share: “Happy Birthday to my sister. I love you Doogie. ♥️”

Erika Jayne wrote: “Happy birthday @kylerichards18 !!!” while also noting that she’s "The heart and soul of #RHOBH 🥳✨❤️”

Kemsley returned to Instagram just to greet her friend.

Kemsley wrote on her share: “Coming back to insta(after a much needed break 😌) to wish my beautiful friend @kylerichards18 a very happy birthday!”

Sutton Stracke, meanwhile, noted: “Happiest birthdays to this beauty @kylerichards18 From chilly to sunny you put a smile on my face. 😽💙”

Garcelle Beauvais and Crystal Minkoof both shared their tributes to their Instagram Story.