Justin Bieber is planning to perform a mash-up of hits at the Grammy Awards.

Justin Bieber

Justin Bieber

The 'Purpose' hitmaker is reportedly rehearsing a mix of two songs, 'Love Yourself' and 'Where Are Ü Now', for the annual music awards ceremony, which takes place on Monday February 15.

A source told Entertainment Tonight that the 21-year-old singer begins with an acoustic version of the ballad and then launching into a "superband" version of his Grammy-nominated song with collaborators Skrillex and Diplo also appearing.

Producer and DJ Jamie xx is also thought to be making an appearance during the performance.

Meanwhile, Lady Gaga is also set to perform at the event, an "experimental tribute" to the late David Bowie.

Ken Ehrlich, executive producer of the Grammy Awards, said: "We had already booked Lady Gaga on this year's show, but when David passed - almost in a single moment - we knew we had to change direction. We immediately spoke and agreed that she should be the one to honour David. She's perfect for it."

The performance will be directed by Nile Rodgers, who was a long time friend of David until he tragically passed away from cancer at the age of 69 last month.