Singer / songwriter Colbie Caillat announced the dates on Wednesday for an upcoming co-headlining tour with Gavin DeGraw.  The lenghty jaunt kicks off May 25th in Simpsonville, South Carolina and spans 22 shows, wrapping up June 29th at the Ravinia Festival in Highland Park, Illinois.  Click Here for a complete list of the dates.  Tickets for all shows go on sale March 30th.