Nicki Minaj surprises YouTube stars on "The Ellen DeGeneres Show" (Video)

(CBS) Sophia Grace Brownlee became a YouTube star last month when an adorable a video of her and her cousin Rosie performing Nicki Minaj's "Super Bass" went viral.

On Wednesday, the pint-sized online sensations, ages 8 and 5, got a big surprise when they got to meet Minaj on "The Ellen DeGeneres Show."

Minaj, 28, told the English girls that she was "blown away" when she saw their video.

"Within five seconds of seeing [her] video, I was calling everyone! I was also receiving a billion emails," she said. "Everyone was like, 'You have to see this little girl.'"

Minaj also told the girls to stay in school: "Put your books first and singing second."

Then, she joined the girls for a rendition of "Super Bass."

You can watch their original video below: