(Because what says “Las Vegas wedding” better than a trio of surprise celeb appearances?)

Then, David Spade and Kimmel’s sidekick Guillermo Rodriguez appeared from a side door of the chapel.

The happy couple seemed a “little too sober and not on my watch in Vegas.”

Celine Dion smiling and waving

After Spade, Guillermo, Kate, and Jason took their shots, Kimmel proceeded with the ceremony.

You may kiss each other on the mouth."

But, of course, that wasn’t the only trick Kimmel had hidden up his sleeve.

David Spade and Guillermo Rodriguez handing shots to wedding couple

The couple and their guests were equally stunned as Dion stepped into the chapel, microphone in hand.

The bride and groom watched the powerhouse vocalist as they swayed to their first dance.

Celine Dion singing to couple Jason and Kate