Sounds like SpaceX founder (and Tesla Motors CEO) Elon Musk is getting married to British-born actress Talulah Riley this weekend in Scotland. That's the word from an unusual source: Musk's ex, novelist Justine Musk. "There needs to be a Hallmark card that certain friends can give you when your ex-husband is getting married to a very young woman in the very near future (say, next weekend) in a country far away (say, in Scotland), and they are planning to attend and don't know how to tell you," she wrote this week. It's the latest chapter in the somewhat public tale of a space entrepreneur's private life.