The short answer? We don’t know. A slightly longer answer? She’s been known to snag one or two of them from boyfriend Ian Somerhalder (Damon Salvatore). For example, in 2011, she was spotted out wearing a newsboy cap that looked suspiciously similar to Mr. Smolderhotter’s.
What can we tell you? If you want Nina’s style, you just might have to find yourself an Ian doppelganger. That shouldn’t be too hard, right?