Up close and personal. Rosie O’Donnell revealed her late “Nip/Tuck” co-star Julian McMahon told her she had a “nice rack” while they were shooting an intimate scene for the medical drama. “He was such a gentleman,” O’Donnell prefaced of the actor while recounting the awkward moment on the “Good Hang” podcast Tuesday. She also revealed that it was the first sex scene she had ever done in her career. “I had a tube top on and little underpants and I’m supposed to be naked. And he’s got a little c—k sock, and he’s leaning and his arms are shaking because he doesn’t want to put his body on mine.” The comedian recounted production telling her…