This has never made sense to me.

Brad Pitt and Tom Brady are the top ones that come to my mind but there are countless examples amongst Hollywood/Sports etc.

Why would you marry a woman who is roughly as famous and rich as you, especially when you're already wealthy, high-status and have an abundance of women to chose?

Maybe I'm wrong but I feel like a woman who's already a multi-millionare and likely has an inflated ego from the fame is NOT a good option for a loyal wife and good mother to your children.

You could go to any poor village in the world and find a hot, loyal wife EASILY. Average middle-class guys do this all the time, imagine how much easier a literally celebrity could do this. But not even to that extreme, they could even find a girl who works as a Starbucks Barista in downtown L.A with nothing else going for her and she would likely may a much better partner than an already established, rich female celebrity.