It seems there’s trouble in paradise for Bruno Mars and his girlfriend, Jessica Caban. The music star has been with Jessica for 13 years after they started dating in 2011, but it seems their relationship might be on the rocks. A source claims their schedules are keeping the Uptown Funk singer and his belle apart. It has been claimed the two didn’t spend either Christmas or New Year together, so could a split be on the cards? Bruno Mars and his girlfriend ‘didn’t spend the holidays together’A source told The Sun, Bruno, 38, and the 41-year-old “barely spend any time together.” “Bruno and Jessic…