Task: Question Answering
Input (English): Passage: "Talk That Talk" was written by Ester Dean, Jay-Z, StarGate, Anthony Best, Sean Combs, and Chucky Thompson, and produced by StarGate. They had produced Rihanna's 2010 hit singles "Only Girl (In the World)" and "What's My Name?" for her fifth album Loud. StarGate told Norwegian website 730.no that it was their first collaboration with Jay-Z and said that they were very satisfied with both the song and each artist's contribution. "Talk That Talk" was recorded at Roc the Mic Studios and The Jungle City Studios in New York City, Westlake Recording Studios in Los Angeles, and The Hide Out Studios in London. StarGate, Miles Walker, and Mike Anderson served as the song's recording engineers. Rihanna's vocals were recorded by Marcos Tovar and Kuk Harrell, who additionally produced them, while Jordan "DJ Swivel" Young recorded Jay-Z's verses. Additional recording of the song was done in Sofitel Paris Le Faubourg and Savoy London hotels. "Talk That Talk" was mixed by Phil Tan and assistant Daniela Rivera at Ninja Beat Club Studios in Atlanta. Eriksen and Hermansen recorded the song's instrumentation, and Tim Blacksmith and Danny D. were assigned as its executive producers.In December 2011, Rihanna asked her fans on Twitter to recommend a song from Talk That Talk for release as the third single. On January 10, 2012, she announced that the title track was chosen and also debuted the single's cover—a black-and-white image in which Rihanna is dressed in "street punk/rockabilly clothes" and crouches against a wall. According to Jazmine Gray of Vibe magazine, the singer has an ambiguous facial expression on the cover. On January 17, Def Jam Recordings serviced "Talk That Talk" to urban contemporary radio stations in the United States. It was also sent to US contemporary hit and rhythmic radios on February 14. On March 26, "Talk That Talk" was released in France as a CD single, which contained the album version of the song and the Chuckie Extended Remix of "We Found Love". 
Question: What is the name of the person who was said to have an ambiguous facial expression on the cover?
Output (English): Rihanna.