It's been a few months since the last time we saw Rihanna stripped to her skivvies for an Armani ad. And though we're tempted to make some crack about how we almost forgot she was an Armani underwear spokesmodel, we gotta be serious here: once we saw pictures of Rihanna in lingerie, that image was permanently burned into our brain banks. Ain't no way we're ever forgetting this, people.