"Her friends and family have been incredibly supportive of her relationship with Josh, and everyone can tell how happy they are together," a source tells PEOPLE of Kevin Costner's ex-wife.

Nearly a year after Kevin Costner and Christine Baumgartner finalized their divorce, Baumgartner is making things official with her new boyfriend.

Connor, who was previously a neighbor of Baumgartner and Costner, is also divorced and has three children. Sources close to Baumgartner have described her as “beyond happy” in her new relationship, adding that she values the stability and shared outlook she has with Connor.