Ariana Grande pays tribute to Mac Miller as she kicks off her 'Sweetener' tour

American singer Ariana Grande kicked off her 'Sweetener' tour last night on a sentimental note. The singer honoured her late ex-boyfriend and rapper Mac Miller. The 25-year-old singer commenced her tour in Albany, New York on Monday. Grande has previously paid tribute to her ex-boyfriend at a number of occasions ever since his sudden death.