Braun and Cohen tied the knot before a group of celeb guests, including Tom Hanks, Sofia Bush and Ed Sheeran, in Whistler, British Columbia.
Bieber and Jepsen, who both hail from Canada, got up on stage during the reception to sing Jepsen's 2012 earworm, "Call Me Maybe."
Bieber congratulated his mentor's new wife on Instagram, writing, "Congrats Yael ;) u looked like a princess last night. And damn I can't believe Scooter found someone that puts up with his bs ;) love you guys."
But the best part of the evening might have come courtesy of Tom Hanks. The 20-year-old pop star shared video of the Saving Mr. Banks actor singing and dancing to "This Is How We Do It" by Montell Jordan.