Both Grande and Slater divorced their prospective spouses after their relationship began. Ariana Grande just started her “Eternal Sunshine” tour, and she’s apparently doing it as a single woman. Both TMZ and People are reporting that the singer of “Thank U, Next” ended her three-year relationship with “Wicked” co-star Ethan Slater several months ago. TMZ noted Slater did not attend the opening show of Grande’s tour Saturday night in Oakland, but a source close to the couple told People there is