Sophia Bush at 'One Tree Hill Casting Call' in Herald Square. New York City, USA - 19.01.08

Bush and her One Tree Hill co-stars found out Federline had won a regular spot on the show when they read about it online. But they dismissed the reports of Federline's casting as groundless speculation.

Bush recalls, "We're looking up blogs, going, `Have you seen this?' And we're going, `That's not real! We would know if he was coming.'

"And then our creators were like, `No, he's really coming.'"

Source: WENN