Here are their ancestral roots, which ends up making them all distant cousins.
From People:
"Justin Bieber is a distant cousin of Ryan Gosling, Céline Dion and Avril Lavigne, genealogists at Ancestry.com said Thursday – with their family links dating back to the early settlers of Canada's Quebec province.
Bieber and Gosling are 11th cousins once removed; he and and Dion are 10th cousins three times removed; and he and Lavigne are 12th cousins."
The happy fam
Okay but isn't all humanity basically related, if you think about it? Like, REALLY THINK ABOUT IT. Okay, now Chew on that for a minute.