Celine Dion's heart will go on for her hometown Canadiens ... 'cause the pop superstar says that pic of her in Vegas Golden Knights gear is a big, fat phony!!!
A photo of the Quebec native decked out in a VGK uniform popped up on the T-Mobile Arena jumbotron ahead of Game 5 of the Conference Finals on Tuesday ... with many wondering if Dion had actually ditched her roots for Sin City.
Of course, home teams love to do this in games -- showing fake pics of their opponents' most famous supporters rocking their threads really gets the fans riled up.