Jason Aldean WARNED ‘Idol’ Kissing Partner — I’m Divorcing My Wife

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Right before Jason Aldean filed for divorce … the country star called the “American Idol” hottie he kissed behind his wife”s back and warned her about the media firestorm to come … our sources has learned.

Sources connected to Brittany Kerr tell us … Aldean placed the courtesy phone call himself last week … and politely warned the singer that he was pulling the trigger on his marriage to his high school sweetheart Jessica Ussery.

Translation — the media”s gonna be all over your ass again … so, govern yourself accordingly.

We”re told Kerr appreciated the heads-up … considering she was Aldean”s kissing partner on the night he cheated on his wife back in Sept.

Since the warning, Brittany”s been laying low — shutting down her social media pages and staying out of the public eye.

It”s not clear whether Aldean and Kerr have communicated since … or whether their relationship has a future.