Ariana Grande review – arch wit from pop powerhouse in training

O2 Arena, London
The cloud-floating, chandelier-swinging Florida singer hits peak schmaltz, then blows the cat-earred crowd awayFive years into her pop career, Ariana Grande is no longer just the one who’s not Miley, Taylor or Katy. She now has a track record of hits – her four-octave contribution to Jessie J’s Bang Bang was one of the big waker-uppers last summer – and a visual style recognisable even beyond the ranks of her tweenage Arianators. Grande’s look, involving sparkling leot