became emotional when a familiar face showed up at the San Francisco auditions for The X Factor
on Sunday - and revealed a personal secret.
When a male contestant stepped onto the stage at the Oracle Arena, "You could see that Britney
recognized him straight away," a source tells PEOPLE. "She got this huge smile on her face and her eyes lit up. It was so sweet."
"I know him," said Britney
, who was sitting on the panel with ...