Katy Perry flips the bird at Ed Sheeran during interview

Ed Sheeran couldn't help but crash Katy Perry's BBC interview after she flipped him the bird on air. 
Katy Perry in the middle of her interview to promote her comeback single 'Chained To The Rhythm' when Ed Sheeran wandered past the studio.
"Oh babes! Thanks for keeping me off the number one spot, THANKS," she said as she gave the one finger salute.
"Oh, you're so approachable, oh, you're everybody's best friend, oh great," she joked as he laughed.
Thankfully Ed Sheeran is good-natured about the banter, and happily gave her a hug as he joined in their interview.
Watch Ed crash Katy's interview above.