What a weird interview.
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!