Britney Spears is getting heat for making a gesture with her middle index finger shortly after her arrival in Mexico City last week, the final stop on her international concert tour, reports Reuters. The pop princess, 20, insists that the finger sign was not intended for fans but, rather, for intrusive paparazzi, says the news service, which referred to her hand sign as "a universally recognized gesture." She was captured in the pose while being photographed as she left the airport in Toluca, some 40 miles from Mexico City. "I'm human, too. I get mad like everyone else," Spears told reporters, according to Reuters, explaining that photographers and camera crews were driving recklessly around her car to the point that she was worried there would be an accident. This weekend, Spears was due to wrap up her world tour at Mexico City's Foro Sol baseball stadium in front of 52,000 fans, her largest crowd yet. "The fans are so amazing, " she said. Meanwhile, on the homefront, Spears's CD sales aren't what they used to be, music publications and the Associated Press have noted. While her latest album, "Britney," is still a top-seller with 3.8 million copies sold, it did not do so well as her previous discs and has brought into question whether Britney is still in fashion as she once was. In fact, reports the AP, R&B singer turned pop-rock princess Pink has sold nearly as many copies as Spears with her second disc, "M!ssundaztood" (3 million copies since last fall), and Pink has made a point in her music and interviews of how un-Britney-like she is.