Real Housewives of New York alum Bethenny Frankel has just let her fans know about her favorite celebrity beauty brand. The entrepreneur took to Instagram to let her followers know that Ariana Grande’s R.E.M. Beauty is tops in her book. In a video that featured some of her products, Frankel wrote in the caption, “the best celebrity beauty brand yet.” Bethenny has reviewed beauty brands in the past, but this time the praise is more than usual. What is your favorite celebrity brand? What is your least favorite celebrity brand?