Blind Item #6

When a movie was first being made about this back in the day former A list pair of celebrities with a unique claim to the A list, the studio making the movie was informed that one of the pair was having an affair with an underage girl too young to drive with the knowledge and support of the other half of the pair. The studio ignored it and forged ahead anyway and made multiple films about the pair. This was before MeToo, but now, maybe, that there is a new film maybe will finally pay attention. Did the studio tell the actors, who are roughly on the same list level, who portrayed the pair?