Photos: Rihanna Exposes Bum Crack At Met Gala After Party.

How more shocking can Rihanna get? We do not think her antics would surprise anyone anymore. At the Met Gala after party Monday night, she wore this derriere baring outfit, that showed her butt crack to all. The party was at the Up & Down Night Club in New York & she hosted the event.

The full length slinky gold dress, with a very low back, was too low that it exposed her bum crack for all the other guests.
Is this s*xy or trashy? More pics below;