British pop star Lily Allen has been warned by her father to avoid drugs - over fears of suffering the same fate as troubled singer Amy Winehouse. Dad Keith has pleaded with the 22-year-old not to experiment with hard drugs. He warns, "Stay off the Ketamin, love. Don't go on the brown (heroin) - look at Amy." But Allen insists his daughter will not ruin her career by becoming a drug addict. He adds, "I feel secure because I know my daughter and the person she is."