Even the most accomplished actors sometimes feel out of their depth on a movie. Gwyneth Paltrow, who returns to the big screen this fall in #MartySupreme, was “way out over her skis” in her early 20s when she played a Park Avenue wife opposite older co-star Michael Douglas in “A Perfect Murder.” Jennifer Lopez, who showcases her triple-threat skill set in the musical #KissOfTheSpiderWoman, felt a “huge” responsibility to get it right when portraying Tejana icon Selena Quintanilla in the 1997 biopic about the late singer. And Emily Blunt, who goes toe-to-toe with Dwayne Johnson in the mixed martial arts saga #TheSmashingMachine, had to avoid being typecast as the go-to “acerbic British bitch” after the success of “The Devil Wears Prada.” These and many more tales from inside the maelstrom of megawatt stardom were the subject of actress roundtable, where Paltrow, Lopez and Blunt were joined by Sydney Sweeney, who transformed physically and emotionally to play boxing legend Christy Mart...