Powerhouse literary agent Luke Janklow has split with Vogue senior market editor Meredith Melling Burke, sources said. Janklow, once dubbed “the hottest straight man in book publishing,” is losing no time in moving forward and is already dating Julian Schnabel’s daughter Stella, multiple sources tell Page Six. Janklow and Burke started dating in late 2011 while both were going through divorces. Janklow was also linked to British writer Jemima Khan. Schnabel previously dated Nicolas Sarkozy’s lanky brother Olivier Sarkozy, who has been seen canoodling with miniature Mary-Kate Olsen. Reps for all parties did not respond to requests for comment.