Hilary Duff had 'the best time' with son Luca as they sang the hits at Justin Bieber concert in LA

The Kid Laroi's girlfriend Katarina Deme, 18, busts out at Justin Bieber's party in Los Angeles

Jackson Mahomes Bombarded With Selfie Requests At Justin Bieber Concert

Tinashe puts on a VERY racy display in a sheer mesh dress at Justin Bieber's concert after party