Jessica Simpson, chatting with The Hurt Locker star Jeremy Renner during a cocktail party for his movie at the L.A. home of Madonna's manager Guy Oseary. Simspon, who lives next door, arrived with hairdresser Ken Paves. But she spent most of her time with the Oscar nominee. "Jeremy spent the night hitting on Jessica like crazy," the source says. "They were really flirting up a storm."