Gwyneth Paltrow and Kim Kardashian joined up yesterday to celebrate the launch of celebrity trainer Tracy Anderson's new flagship studio in Brentwood, California. Gwyneth wore a purple Victoria Beckham dress and Michael Kors shoes as she lent her support to her longtime friend. Gwyneth spoke with us at the event and shared one of her motivation secrets for getting into workout mode. She said, "I just sob and kick and scream and then just force myself to do it." Gwyneth isn't the only fan of Tracy's intense workouts — Kim has said that she is working out with Tracy throughout her pregnancy so she can stay active and healthy. Other stars like Molly Sims and Stacy Keibler also showed their support for Tracy and her famous fitness method at the launch.