"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.

Kevin Costner’s ex-wife, Christine Baumgartner, is engaged to her boyfriend of over a year, Josh Connor, who happens to be former friends with the “Yellowstone” alum. Baumgartner, 50, said “yes” to Connor’s beachside proposal in Santa Barbara on January 26, less than one year after finalizing her divorce with Costner.