At the Kentucky Derby on Saturday, Kid Rock did more than just bet on the horses – he ponied up fatherly advice to Kevin Federline.
Federline, 29, should keep his sons with Britney Spears (Sean Preston, 1, and Jayden James, nearly 8 months), and his two kids with Shar Jackson (Kori, 4, and Kaleb, 2), out of the limelight, Rock told him.
"You never see me photographed with the kids," Federline replied, Rock tells PEOPLE.
Earlier that morning, however, it seemed like neither minded the attention. At a party at Louisville's Felt nightclub, sponsored by the New York hotspot Stereo and Pama liqueur, Rock took control of the DJ booth around 4:30 a.m. before engaging in a rap battle with Federline.
"Everybody wanna be a friend of mine – you, you, you, you, you, you and even Federline!" Rock rapped.
"I like calling that kid's name really loud," he joked later.