My ex’s new boyfriend, and I, are getting married on the same day.

I (30m) dated my Ex (29f) for two years, we broke up on good terms. She is a very nice person. Her new husband, and my new wife are also very nice. <br><br>It’s just so weird that, they are getting married on the same day I am (Saturday). <br><br>How do I approach my soon to be wife Cat (30f) about, her new sisters husband also being my ex boyfriend?