Justin Bieber Instagrams Tom Hanks Singing 'This Is How We Do It' At Wedding (VIDEO)

It's impolite to draw attention away from the bride and groom at a wedding – unless you're Tom Hanks.

The "Forrest Gump" star jumped on stage to sing and dance to Montell Jordan's "This is How We Do It" at the marriage of Scooter Braun, Justin Bieber's manager, to F--k Cancer founder Yael Cohen in Whistler, B.C.

And thanks to Biebs, we can all see the hilarious performance for ourselves on Instagram.

The wedding was a star-studded affair with guests including Carly Rae Jepsen, another of Braun's clients, who sang "Call Me Maybe" with Bieber.

U.K. singer-songwriter Ed Sheeran also attended. He performed his own take on Blackstreet's "No Diggity."

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