One Last Time (Jason Reilly Remix) Ariana Grande
As well as accusing her of stealing their song, Dan and Katy also talked about her new single and putting Mel B in a bin.
It was only a few weeks ago that Dan, Katy and Posh Ben forced their way in to Katy B's dressing room at the O2 Academy... But it obviously didn't put her off too much as she decided to come in again!
This time the lovely Katy B was in the studio and chatted about all sorts - listen below!