IT looks like things are heating up between Kid Rock and his former girlfriend, Conchita Leeflang. Page Six broke the news last week that Rock had been in touch with Leeflang during his marriage to Pamela Anderson, and when he split from Anderson, he landed back in the Suriname native's arms. Now comes word that Rock, who immediately moved back to his hometown of Detroit after the split, flew to L.A. for Leeflang's birthday party at rapper Eddie Mayhem's house this weekend