Kylie Jenner made her acting debut in Charli XCX's The Moment - and she's doling out advice to the British pop star. "The second people are getting sick of you," Jenner, 28, says in a Thursday, December 11, trailer for the upcoming film. "That's when you have to go even harder." Charli, 33, will star in a mockumentary-style A24 film, where she plays a pop star planning to launch a global concert tour. "Everybody's so desperate for me to be f***ing innovative all the time - and f***ing cool," Charli says elsewhere in the trailer.