What a weird interview.
Well, it all started when, the pop star saw Sheeran walking past the window of the studio (where he was busy covering Little Mix btw) -- and flipped him the bird for keeping her off the number one spot. However, this exchange motivated the Shape Of You singer to totally crash Miz Perry's interview -- where he got candid about their particularly sweaty first meeting.
While Katy didn't initially want to hug the sweaty Ed, she (jokingly) says nowadays she'd let the hitmaker put his "ball sack" on her. Girl, chill.
Regardless, this wasn't the only bizarre memory the twosome exchanged in front of the show's host, Nick Grimshaw (AKA Grimmy). There's even an anecdote that involved armpit sniffing...
Ch-ch-check it out (below) to get the full story!