Assertions such as this require linkage verification, per Al Gore.
That PopSugar site is a chick "Celebrity Gossip" site. I've seen it before.
The purpose of the photo is to show that he was at the World Cup, not to show off his Auburn hat.
If the picture stood alone on an Auburn forum, I may question it. If it's clearly there on he PopSugar site, I see no reason to believe it's a photoshop.