Nicki Minaj has been treated to a rap battle with a reporter following her June 25 London show.

The journalist unexpectedly burst into song, much to the delight of Minaj, who roared with laughter.

She then responded with her own rap, complementing the interviewer's t-shirt - and her vocal skills.

Nicki is on tour in the UK ahead of a series of major arena events later in the year.