Kevin Costner could care less about ex-wife Christine Baumgartner dating his former friend. According to an insider, the Yellowstone actor, 69, has gotten quite a chuckle from the designer’s budding romance with their past neighbor and pal Josh Connor, which comes less than a year after the couple ended their marriage. “Kevin finds the whole thing hilarious,” the source claimed. “Kevin just hopes Josh has deep pockets because Christine has expensive taste!” After Baumgartner filed for divorce from Costner in May 2023, she had been looking for another man to support her. “Christine’s training h…