The 'Whip My Hair' singer announced the news today on Twitter.
She tweeted: "Got news that my big bro @justinbieber invited me on his European Tour in March..so exciting! Maybe I'll let Jaden come..LOL. (sic)"
The 10-year-old star joined Bieber on stage at a concert in October.
It was recently announced that Smith is to appear on ABC's Dick Clark's New Year’s Rockin’ Eve special.