Originally Posted by The Boy Scout
Who else would be better able to understand the demands of a particular lifestyle than someone who's in the exact same position?
I always thought it was because if you're a celeb, you never know if that "normal person" is with you just because you're famous or not. Although sometimes budding starlets will try to get with a more famous actor to be more famous themselves so....
Two go-getter celebs are usually a bad idea. One actor's ego is usually enough for a relationship, let alone two.
The only actor couples that work, are ones where one partner is comfortable in letting the other take the stage and vice versa. Kevin Bacon hasn't been high-profile but Kyra Sedgwick has. Brad Pitt still does movies but Angelina Jolie hasn't done them in a while. Amy Adam's fiance is an actor but she's obviously more famous than he is.
It usually doesn't work when they both have to be in the spotlight at the same time.