The two main components of under-age superstardom, Justin Bieber and Willow Smith, have announced they will be touring together.

The two have teamed up before with Willow joining the ‘Baby’ singer on stage at an October gig in Los Angeles for a version of her single ‘Whip My Hair’. Now, Willow announced on Wednesday that she will be joining the European leg of 16-year-old Bieber’s world tour.

On her personal Twitter page Wednesday (December 8), Willow wrote: "Got news that my big bro Justin Bieber invited me on his European Tour in March. So exciting! Maybe I'll let (brother) Jaden come. LOL (laugh out loud)."

Bieber – who has previously collaborated with Will Smith’s other offspring, son Jaden – confirmed Willow’s news by re-Tweeting the ten-year-old’s message and also suggested to his fans that he has more in store, saying: "Willow get ready... I got more surprises coming."

Watch Willow and Justin performing together at the Los Angeles Staple Centre below: