The confusion began after the "Diamonds" singer was filmed giggling while Grande performed a medley of her track "The Way" and her latest single, "Problem" during Monday's award show.
The 20-year-old singer expanded on the issue during an interview with Australian radio show, The Bumo Show.
"[Rihanna] wasn't laughing at you, she was laughing at something your best friend said," the show's DJ said of the situation. "I know you guys caught up afterwards, did she clarify that?"
"I didn't see her laughing at me," Grande responded, "but when I watched it afterwards it looked like she was just shocked because I was doing something different."
"Afterward she was so kind to me, she was like, 'Lil' mama keep doing what you're doing because it's working,'" she continued.
The Sam & Cat actress went on to say that she finds it "funny that people tried to make such a commotion" of the situation.
"[Rihanna] was just being playful and supportive," Grande said. "People are always trying to make a big deal out of nothing because they're bored."
You can check out a video of Grande's performance below. Rihanna's reaction comes up at the 2:05 mark.