We were wondering why Rihanna showed up to Jimmy Kimmel Live with a smirk on her face, and now we know why!

On Wednesday the 26-year-old R&B superstar made an appearance on the show, but the previous night she participated in a totally hilarious prank in which she woke up the late night host. Assisted by Jimmy's wife Molly McNearney, Rihanna crept into his house in the wee hours of Wednesday morning with some bandmates and gave a loud (and well-lit) performance of "B*tch Better Have My Money."

Bad Gal RiRi threw money and confetti on Kimmel and then danced on the bed, and we have to say, it looks like Kimmel truly had no idea what was happening. Not only did he appear totally dazed, but he took a moment to remove his mouthguard when he realized what was going on.

When she appeared on the show, Rihanna said, "I am a really big fan of your April Fools' pranks so I was like, 'I want to do that! If I'm going to go on the couch, let's get him back!'" she said. She wins!