Josh Hamilton's wife Katie says she was completely "blindsided" by her husband's decision to file for divorce -- telling TMZ Sports she'll always love the baseball star.
Hamilton filed the divorce docs back in February ... seeking to end their 11-year marriage.
"It came out of nowhere," Katie says ... "There was no big fight or blow up. Nothing sparked it."
As for reports that Katie cheated on Josh, Katie says they're ENTIRELY FALSE ... "I never cheated on my husband. Are you kidding me? I did my marriage the entire right way."
Despite the shocking split, Katie says she has nothing but love for Josh -- and wants nothing more for him to be happy and successful in life.
"I've always stood by him and I'll always stand by him. I support and love him now and down the road."