"I have tried to tone down my language. I would never use the 'C' word in front of my children. I wouldn't mind them swearing in my house, when they're older. The only thing I have with swearing is that I wouldn't want them to pick it up, say it in front of their friends and their parents, who then say, 'I don't want your kids hanging around with my kids'." British pop star Lily Allen fears her penchant for using foul language will rub off on her two daughters and affect their social lives as they grow older.