"E=MC²" debuted at number one on the "Billboard" 200 with 463,000 copies sold, the biggest opening week sales of her career. In 2008, Carey also played an aspiring singer named Krystal in "Tennessee" and had a cameo appearance in Adam Sandler's film "You Don't Mess with the Zohan", playing herself. Since the album's release, Carey had planned to embark on an extensive tour in support of "E=MC²". However the tour was suddenly cancelled in early December 2008. Carey later stated that she had been pregnant during that time period, and suffered a miscarriage, hence she cancelled the tour. On January 20, 2009, Carey performed "Hero" at the Neighborhood Inaugural Ball after Barack Obama was sworn as the first African-American president of the United States. On July 7, 2009, Carey – alongside Trey Lorenz – performed her version of The Jackson 5 song "I'll Be There" at the memorial service for Michael Jackson.