Kim Richards and her sister Kyle Richards, both of Bravo's "The Real Housewives of Beverly Hills," reunited for the former's 51st birthday Saturday after months of estrangement.

The two already had not spoken in three months when a previous attempt at a reunion went awry on an episode of their show that aired in April, and E! reported in July that they were still not speaking with each other then. Tensions were exacerbated by Kim Richards, who was born in Mineola, having substance-abuse issues that led to rehab this spring, as well as an April incident at the Beverly Hills Hotel that culminated in her pleading no contest on Sept. 14 to a misdemeanor charge of resisting arrest.

On Saturday, however, both former child actresses posted Instagram photos with two of Kim Richards' daughters, Whitney Davis and Brooke Wiederhorn, and son-in-law Thayer Wiederhorn.

"Happy birthday . . . May all your birthday wishes come true. Love you," Kyle Richards, 46, captioned one photo.

Kim Richards captioned one of her own, "Such a great Birthday. I am completely blessed!! . . . I love you all so much," she wrote, adding that she missed her other two children Chad Davis and Kimberly Jackson. "Spent some fun quality time with my sister . . . . Life is Good." Brooke Wiederhorn wrote on an Instagram post, "Happy Birthday to my beautiful Mom! I love you so much!"

E! said Sunday that the group was at a birthday dinner at the steak and seafood restaurant Ocean Prime in Beverly Hills.

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As an actress, Kim Richards is best known for her role as young Prudence Everett on the 1970-71 ABC sitcom "Nanny and the Professor."

She went on to appear in numerous Disney films and TV projects, and as adult in films including "Black Snake Moan" (2006).