Despite what one might think, Dan Brown didn't concoct the Da Vinci Code's account of Christian history out of thin air.  Stories about an intimate connection between Christ and Mary Magdalene have been around for a while, and not only among conspiracy buffs. 

Below, for example, is a devotional icon of Jesus, Mary M & their child from prizewinning artist Sofia Christine's Ambrozjin collection.  This same image is available in smaller form as a pendant or pins.