Rod Stewart froze his sperm "in case of problems", his fiancée Penny Lancaster has revealed.The blonde model, who is expecting her first child with the ageing rocker next month, said they had taken the precautionary measure at home before trying for a baby. Sexy Penny, whose 'Roddy' has six children already, also confessed to popping his DIY sample into her handbag before rushing it to a sperm bank in her sports car. She explained: "We did freeze Rod's sperm in case there are going to be any problems. We were at home. We didn't do it at a hospital. We were at home privately, you know, intimately"She added to TV chef Gordon Ramsey on his hit show 'The F Word': "And then I rushed down in the Ferrari with my handbag and the little vial next to it" Last week, it was revealed Rod is ready to be an emergency midwife - in case the couple can't get to hospital in time. The singer has been attending ante natal classes to learn what to do if Penny goes into labour unexpectedly. But the star admitted he fell asleep in some of the early morning tutorials because he had stayed up late watching soccer on TV. He revealed: "I've done my emergency birth classes in Los Angeles But I would always fall asleep in the morning because I'd had to get up to watch football in the middle of the night"