With tabloid allegations circulating that Kutcher, 32, cheated on Moore, 47, the couple are presenting a united front. On Sept. 18, Kutcher visited Moore on the Michigan set of her film The Reasonable Bunch. During the visit, a set source says the couple seemed as loving as ever: "She gushes over Ashton," the source tells PEOPLE in this week's cover story. "You could hear them laughing in her trailer."
Privately, another source says, the couple are "angry" about the rumors and have instructed loved ones not to inquire: "Kind of a 'don't ask, don't tell' policy."
But others are not so sure their much-scrutinized age difference hasn't finally caught up to the couple. "Somehow I thought it was going to come back to haunt them," says an industry colleague. "He got married young and, as crass as this sounds, never seemed to have his fill." Still, "they seemed super committed."
For much more on the rumors and their romance, pick up this week's issue of PEOPLE, on newsstands Friday