Alan Cumming Celebrated His 50th Birthday in a Speedo

Inside the Cabaret star's wild party

As Molly Shannon's famous Saturday Night Live character Sally O'Malley would say, "I'm Fifty!"

Alan Cumming celebrated his 50th birthday this week by partying at Studio 54 wearing only a Speedo (what else would you expect from him, right?).

The Cabaret star, whose actual birthday was yesterday, took to Instagram the other day to share a funny party pic of him nearly sporting his birthday suit. "This is what fifty looks like!" the always-colorful Scottish star captioned the b-day photo.

@AlanCummingSnaps celebrated his 29th birthday as the Emcee at London?s Donmar Warehouse, his 33rd birthday rehearsing for his Broadway debut in 1998, and now his 50th at Studio 54! Join us in wishing Alan Alles Gute zum Geburtstag!?

A photo posted by @cabaretthemusical on Jan 27, 2015 at 3:42pm PST

In the snapshot, Cumming shows off his body in just a tiny red Speedo, a matching headband and some party necklaces. The birthday boy flashes a smile while sitting on the shoulders of a male pal.

Meanwhile, Cumming is surrounded by partygoers dancing under a disco ball inside the famed NYC club.

Cumming's Cabaret production also took to Instagram to wish the longtime Broadway star well wishes. "@AlanCummingSnaps celebrated his 29th birthday as the Emcee at London's Donmar Warehouse, his 33rd birthday rehearsing for his Broadway debut in 1998, and now his 50th at Studio 54! Join us in wishing Alan Alles Gute zum Geburtstag!"