Fans had previously pointed out similarity between Bieber hit and Grande's 'One Last Time'
The pop singer was caught on camera licking items at Wolfee Donuts in Lake Elsinore, California
Pop singer says she's 'going to learn from my mistakes'
The singer also claimed to 'hate America' during the CCTV footage - watch
Grande hits out at the media's 'double standard' following her split with rapper Big Sean
Singer confirms news to a Twitter fan
Timothy Normandin is detained on suspicion of criminal trespass
Pop star is accompanied by songwriter David Foster
Pair perform Grande's 'Love Me Harder' and Bieber's 'As Long As You Love Me'
Singer names Imogen Heap among influences days after she falls over on stage