Here are the stone-cold facts.
• This is Tom Hanks dancing.
• He's shaking his booty to This Is How We Do It by Montell Jordan.
• Justin Bieber filmed this exquisite performance and posted it on Instagram.
• Biebs captioned it: "Haha Tom Hanks singing 'This Is How we do it' dressed like a Rabbi lol #thatdancetho,"
• It was filmed at Biebs' manager Scooter Braun's wedding.
• He was marrying a young lady called Yael Cohen in Canada.
• Ed Sheeran, Carly Rae Jepsen and Sophia Bush were also at the star-studded do.