She may be the "Only Girl in the World" in her new video -- but Rihanna still looks like she's having a whole lotta fun all by herself!
The video, which popped up online today, was directed by Anthony Mandler -- who did a ton of other RiRi vids, including "Te Amo," "Disturbia," "Rehab" and "Unfaithful."
The song is the first cut from her next album, "Loud," which comes out November 16.