Machine Gun Kelly is in family vacation mode.  The Mainstream Sellout artist, 32, shared a glimpse of his jaunt through Europe with 13-year-old daughter Casie Colson and fiancée Megan Fox, posting photos Friday from the trip on Instagram. “It’s my daughter’s first Europe tour,” he wrote in the caption. The trip included a stop at the Louvre in Paris, as well as a visit to designer …