Bieber, wearing a Matthews jersey, attended the game in Toronto with his dad Jeremy and sat behind the Maple Leafs' bench, then peppered his Instagram with excited posts.
Instagram from @justinbieber: Let's go leafs
Instagram from @justinbieber: Dad and son date
In addition to photos, Bieber posted a video on his Instagram stories of the viewpoint from his seat including a zoom in on Toronto coach Mike Babcock's hand resting on a water bottle holder.
Needless to say, Bieber was excited to be there to see his beloved Maple Leafs, as also evidenced by the times he was shown on camera during the broadcast. He was downright jubilant when Toronto forward Morgan Rielly scored the go-ahead goal with early in the third period.
After the game, he posted a picture of Matthews with the caption, "The goat" and a picture of himself and his dad sharing a laugh.
Instagram from @justinbieber: The goat @auston\_matthews
Instagram from @justinbieber: More information
A couple of months ago, Matthews posted a photo on Instagram of himself wearing a shirt from Bieber's Drew House clothing line.
Instagram from @auston\_matthews: Back to schoolđ
It's clear there's a mutual admiration, and Bieber left one happy fan between the win and seeing Matthews score a dazzling goal.