In the video David can also be seen trying to decide where to sign on the door!
The video was posted by Alice Orr-Ewing who played the bride Mattie in Don Juan In Soho.
David Tennant played the title role in Patrick Marber's Don Juan In Soho at the Wyndham's Theatre in London from Friday 17th March 2017 until Saturday 10th June.
Apologies if this video does not play in your country.
DT signing the door of the Wyndham's under @SirPatStew and @IanMcKellen 🚪 🚪🚪@davidtennantcom pic.twitter.com/Z6yNmSGmoL— Alice Orr-Ewing (@aliceorrewing) May 26, 2017