Beyoncé really, really loves the number four.To hear her explain it, the numeral has been an invisible hand guiding her through life. She was born on September 4, and Jay Z was born on December 4. Their daughter's middle name is Ivy, after the roman numeral four. And that number is tattooed on both Bey and Jay's hands, as a wedding-ring alternative.Good things come in fours for Bey. In her Live at Roseland: Elements of 4 show (a series of concerts that lasted, of course, four nights), Yoncé herself went into the logic behind the number's importance in her personal life. "On April 4, 2008 — eight divided by two is four — [Jay Z] put a ring on it," she explained with a giggle.We crunched all the numbers, and it looks like Bey is onto something. Four is her lucky number for all the best reasons.