Rihanna wore a custom black Giorgio Armani gown with a plunging neckline on the red carpet at the 2012 Grammys. Rihanna says she helped Giorgio Armani design the dress. She says she wanted something a little "Michelle Pfeiffer from Scarface." She wanted something "simple, but sexy and a little gangster at the same time." You can see a still photo of the dress here.
Rihanna also revealed is also working on a capsule collection for Armani. She says, "He trusts my design a little bit now, so I got to play with him." Take a look: