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Jonathan Bailey has been changed for good ... after being named People Magazine's 2025 Sexiest Man Alive.

The big reveal went down Monday night on 'The Tonight Show' ... where the "Wicked" star shocked fans by walking out on stage after Jimmy Fallon made the announcement.

Bailey told Fallon being on the cover is the "honor of a lifetime." People/Jason Hetherington

The actor is featured on two covers -- one showing him deep in water, slick-haired and locking eyes with the camera ... and another where he's shirtless, holding his pup, Benson.

Bailey's staying humble about the title ... telling PEOPLE he's "incredibly flattered" and it's "completely absurd." Gallery Launch Gallery Getty

This marks the 40th anniversary of the iconic issue ... with John Krasins

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