Nicki Minaj surprises YouTube star fans from Essex

Last updated at 15:57
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Watch Nicki Minaj surprise Sophia Grace and Rosie (courtesy of WAD Productions Inc/Warner Brothers)

Nicki Minaj gave two British fans the surprise of their lives, when she turned up to duet with them on a US chat show.

Sophia Grace, 8, and cousin Rosie, 5, from Essex, have become YouTube stars thanks to their online cover of Super Bass.

Sophia Grace screamed as Nicki walked on during their appearance on The Ellen DeGeneres Show.

Nicki called her a "superstar" before they sang Super Bass live together!

Sophia Grace and Rosie's video has had more than 9 MILLION views in less than a month.

Nicki said: "Within five seconds of seeing this video, I was calling everyone I know.

"Everyone was like, 'You have to see this little girl' - she blew me away."

But the rapper advised the girls: "I want you to stay in school, put your books first and singing second."

She then promised to treat them to a shopping spree! Some kids have all the luck!