From the X-Men continuity, Wonder Man is a talented TV actor. His invulnerability allows him to portray his own stunts. Here we see him in 'House of M' #02 being interviewed on daytime television.
Although she's more famous as a singer, Dazzler was briefly rebooted as a wannabe actress, culminating in the one-shot comic "Dazzler: The Movie".
Within the world of the Watchmen, Sally Jupiter (AKA Silk Spectre) parlays her popularity as a vigilante into a series of low budget films including a heavily fictionalised version of her life story and a number of deeply 'kitsch' films masquerading as superhero films but in reality, little more than bondage porn.
From the hit film, 'Hero at Large', actor Steve Nichols takes on the role of Captain Avenger. While doing publicity for the film, Steve foils a robbery and gets hired by the mayor to help him gain support for an upcoming election. At the end of the film, Steve becomes a true hero by rescuing a young child from a burning building.
Quite how this film missed the Oscar nomination is beyond me.
For much of his early career, Captain America was an actor working on behalf of the US govt to help sell war bonds. He evidently also made some Hollywood productions.