Katy Perry is the current queen of pop music, and a sold-out crowd of neon-clad, primary-colored haired subjects packed the Forum to the rafters on Monday night.

Katy Perry is the current queen of pop music, and a sold-out crowd of neon-clad, primary-colored haired subjects packed the Forum to the rafters on Monday night.

Katy Perry is the current queen of pop music, and a sold-out crowd of neon-clad, primary-colored haired subjects packed the Forum to the rafters on Monday night.

Katy Perry is the current queen of pop music, and a sold-out crowd of neon-clad, primary-colored haired subjects packed the Forum to the rafters on Monday night.

Katy Perry is the current queen of pop music, and a sold-out crowd of neon-clad, primary-colored haired subjects packed the Forum to the rafters on Monday night.

Katy Perry is the current queen of pop music, and a sold-out crowd of neon-clad, primary-colored haired subjects packed the Forum to the rafters on Monday night.

Capital Cities performs as an opening act for Katy Perry at the Forum.

Ferras performs as an opening act for Katy Perry at the Forum.

Katy Perry is the current queen of pop music, and a sold-out crowd of neon-clad, primary-colored haired subjects packed the Forum to the rafters on Monday night.