Rih recently celebrated her grandad's birthday, so the party hats were out. This image appears in the gallery:Rihanna Covers US Elle Magazine's December Issue 6. Rih recently celebrated her grandad's birthday, so the party hats were out. www.elle.com/news/culture/december-2014-editors-letter-rihanna Picture: Paola Kudacki for ELLE 7 images See the full gallery: Rihanna Covers US Elle Magazine's December Issue