George Clooney celebrated his 57th birthday by downing a shot of tequila.

The Hollywood heartthrob marked the milestone on Sunday by knocking back a glass of his own Casamigos tequila.

A video on social media shows Clooney and his friend and business partner Rande Gerber standing alongside each other, each with a shot glass resting on a board.

As their friends clap and call out, they raise the board and swallow their drinks.

Clooney then pretends to fall backwards.

The clip is captioned: “When the bosses spend too much time in the office, this happens!

“Happy Birthday, George!”

The tequila brand was founded by Clooney, Gerber – who is married to model Cindy Crawford – and Mike Meldman in 2013.