The 29-year-old 'Hard Out Here' singer, who has admitted to a wild past including cocaine abuse, has insisted she isn't in a position to tell Ethel, two, and Marnie, one, about the dangers, reported BBC online.
"I can't really do anything but be there for them. People are going to do what they want to do, quite rightly. They'll say, 'You're a hypocrite. You went an experiment and you said it was a right laugh so what do you mean I can't?'" she said.
Meanwhile, Allen has praised her husband Sam Cooper for helping her overcome her personal problems by 'showing up at the right moment'.