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Howard and Bernadette's big day has finally arrived!

VIDEO: Could 'The Big Bang Theory' Have a Runaway Bride?

Last week the pair earned their blessing from Bernadette's (Melissa Rauch) father and in tonight's brand-new episode, the duo attempts to say their "I do's" before Howard (Simon Helberg) skyrockets into space.

Check out our exclusive behind-the-scenes look at all the inevitable shenanigans as the happy couple embarks on their life-changing ceremony.

VIDEO: 'Big Bang Theory' Cast Celebrates 100th Episode

Don't miss tonight's season five finale of The Big Bang Theory, only on CBS.