Niecy Nash's Bootytrocious Fashion "911"

Her name is Niecy Nash, but last night, it was all about Niecy's ASS!

The comedian showed off her, er, biggest asset in a tortured one-piece thong swimsuit -- at the Hollywood premiere of her new film, "Reno 911: Miami." Baby got back and den sum!

Since Nash plays a cop in the film, this should be the first bum she gets off the street!