Live music events including Coldplay, Taylor Swift, Vijay Antony, and Diljit Dosanjh concerts also saw a 43% increase, according to the report.
Industry body VoxComm said the rise of this model puts agency-client relationships at risk.
The latest campaign features actors Elle Fanning and Nazha, model and songwriter Koki, and rapper Youngji Lee, all of whom are global ambassadors for Coach.
Industry leaders weigh in on what Dentsu, Omnicom, Publicis Groupe and Interpublic Group results mean for media.