The phrase "to support the stars" means to provide help or assistance to famous or talented people. It is about offering encouragement, admiration, or resources to ensure the success and well-being of well-known individuals. Full definition
Nothing extra is asked of, or received from, the fine actors lined up to support the star turn, and production values are ordinary. (hollywoodreporter.com)
Once upon a time, horror movies had a leading cast of around five disposable teenagers and multiple supporting stars beyond that. (oracleoffilm.com)
Renowned for his pivotal scene - stealing role in Horrible Bosses, Byrne's character supports the stars of the film as they plot to kill their bosses. (amctheatres.com)