Lady Gaga isn't the only one with SoulCycle fever.

Turns out Bradley Cooper signed up for a session for one of New York City's famed classes, and his presence made spin class hotter than Bikram.

The "Silver Linings Playbook" star turned up shirtless -- which caused his fellow cyclists to swoon. Fitness enthusiasts at the Tribeca studio, and Page Six reports the ladies were "literally falling off their bikes."

Can this studio come to Chicago already?