During a Wednesday, July 17, appearance on Late Night with Seth Meyers, Michael Cera ... unrecognizable in bleach blond locks, a dramatic change-up from his usual brown hair.

When he came out on stage, Meyers said his producer warned him that Cera had gone blond ... He added, "My hair is in a weird place right now." Michael Cera reveals Ben Affleck's planned Barbie ...

“My producer today said, ‘Michael wants ... Cera, whose natural hair is blondish brown, was sporting an uncharacteristically conspicuous head full of bleach-blond frizz.

"We had a lot of iterations of hair that weren't quite right," Cera tells PEOPLE of his dramatic blond transformationMichael ...

During a Wednesday, July 17, appearance on Late Night with Seth Meyers, Michael Cera ... unrecognizable in bleach blonde locks, a dramatic change-up from his usual brown hair.