Is Rihanna spiraling out of control?

Her hard partying has already made her late to several European concerts, as Breaking Celebrity News has reported. But despite those embarrassments and increasingly tepid reviews, she had no problem partying all night with model Cara Delevigne in London on Sunday the night before her concert in Birmingham, for which she showed up more than two hours late.

Rihanna and Cara were out and about in London on Sunday, partying at Bouijs nightclub with Rihanna's brother, Rorrey, and her assistant, Melissa Forde, until 3 a.m.