Chad Michael Murray and Hilarie Burton rave about Britney's ex
Credit: Evan Agostini/AP

Chad Michael Murray and Hilarie Burton on Tuesday’s TRL raved about Kevin Federline‘s professionalism during his time on the One Tree Hill set.

“He showed up and he was so professional and so nice. He brought his mom to the set,” said Burton, 25, in a clip on the

She confessed that before Britney Spears‘s ex-husband showed up to film his recurring role on the drama, she wondered what it would be like. But, she said, “He worked really, really hard and was totally there to act. He wasn’t there to make a spectacle of himself or to party or anything.”

Murray also chimed in to compliment Federline, 29, saying, “He did a great job.”

Asked if the two did any male bonding, Murray, who turned 26 in late-September, smiled and said, “He came and celebrated my birthday with me.”

As PEOPLE reported in the fall, Federline partied like a rock star with the One Tree Hill cast at The Liquid Room club in downtown Wilmington, N.C.