These days, Paris Hilton is busy and excited … not only with building her business and entertainment empire, but preparing for her three-day wedding. She plans to wear some 10 gowns and to make a special TV docuseries about the planning called Paris in Love , according to BuzzFeed News. So who is Carter Reum, the 40-year-old man who the party queen is tying the knot with? He’s a total catch, it turns out … 6 things you need to know about RHOBH’s latest star, Kathy Hilton His dad is a millionaire Born in 1981, Carter Reum was the son…