Question: Which highest grossing tour of 2011 featured someone from the audience performing a lap-dance?
Sentence (from "Loud Tour"): Performing in over twenty countries in the Americas and Europe, the tour was launched in support of Rihanna's fifth studio album "Loud" (2010) but eventually supported her following album "Talk that Talk" as it was released during the tour, in November 2011.
Relevant evidence: No