8/11/2016 9:56 AM PDT BY TMZ STAFF
Justin Bieber has a teenybopper on his tail … she follows him everywhere these days. She’s 17.
Sofia Richie — daughter of Lionel — joined the 22-year-old on his private jet Thursday … likely bound for Japan where he’s appearing this weekend.
They’ve been inseparable for the last few days.
Lionel’s little girl turns 18 in 13 days.