The baby-faced Ariana Grande may look super-sweet and innocent, but according to Ed Sheeran, the "Problem" singer definitely has a naughty sense of humor.
After plenty of people noticed Ed's goofy -- and constant -- grin while performing at the Victoria's Secret Fashion Show last Tuesday, Ed revealed the surprising reason behind it in a new interview with Elvis Duran and the Morning Showhost Elvis Duran.
"Can I tell you why I was laughing?," he begins to explain. "Basically there were all these big inflatable bouncy black balls bouncing around in the crowd in the finale bit when we go there. And Ariana Grande comes up and stands up next to me, and just looks at me and goes, 'I love big black balls.' In my head I was like, 'If she knows what that means then I love her, and if she doesn't know what that means, it's even better!'"
PHOTOS: The Jaw-Dropping Styles from This Year's Victoria's Secret Fashion Show
Ariana, 21, is currently dating rapper Big Sean, 26.
Though perhaps Ariana's dirty joke shouldn't come as too much of a surprise.
In August, the petite singer talked to Billboard magazine about the common misconceptions about her based on her image.
"I think people see me as a little cutesy thing," she said. "But I'm literally the most sardonic person you've ever met."
Ariana and Ed joined Taylor Swift as the musical acts performing at this year’s Victoria's Secret Fashion Show -- airing tonight at 10 p.m. EST on CBS -- and though Ed obviously had a good time surrounded by all of the gorgeous models, he did admit that it didn't exactly boost his self-esteem.
"It was fun, but I kind of felt like the hobbit in an elven kingdom," he admitted to Elvis.
PHOTOS: Behati Prinsloo Has the Most Adorable Meltdown Ever at the 2014 Victoria's Secret Fashion Show
Check out the video below to go inside, Ed, Ariana and Taylor's big night performing at the 2014 Victoria's Secret Fashion Show ahead of tonight’s broadcast.