He's the commander-in-busting-a-move.
Bush, 71, can be seen bobbing his head as he boogies with the bride, Sarahbeth Melton, to the 1984 song "You Spin Me Round (Like A Record)".
Guest Shiree Nelson posted a gallery of images from Saturday's celebration, including the dance video.
Pierce Bush's sister, Lauren Bush Lauren, posted a photo of the couple at the ceremony.
Pierce's dad is Neil Bush, brother of the dancing former president and the fourth of ex-president George H.W. Bush's six children.
Here's one last look at George W. Bush cutting a rug.