In the eighth season opener, Kyle and Lisa Vanderpump charter a private jet to take the ladies to Las Vegas for a group birthday celebration, but the question of whether Lisa Rinna will join lingers. Dorit's new friend Teddi hits it off with Lisa Vanderpump over drinks and they invite her along for the ride. Lisa Vanderpump assesses her friendship with Erika and begins to see their relationship in a different light. The ladies let loose in Sin City, with familiar faces Adrienne Maloof and Camille Grammar joining the festivities.

As she writes her memoir, Erika is forced to revisit her past and gets emotional about her father. Lisa Vanderpump helps PK throw a lavish birthday dinner for Dorit—and the unlikeliest of guests gives a speech. Teddi starts to question Dorit's character when Dorit speaks badly about Lisa Rinna. Meanwhile, Kyle vacations with her family in Croatia.