Britney Spears has been warned to take an Aids test before she marries fiancé Kevin Federline. The sexy star has been told to get tested by the dancer's former girlfriend, Kerri Whittington, who claims the former dancer has had unprotected sex with a string of girls. She is quoted by Britain's Daily Mirror newspaper: "Kevin's slept with so many women, Britney should get an Aids test. He is a charmer who has been around and he never used protection with me." Meanwhile, Britney's father has reportedly been admitted to rehab to fight addictions to drink and drugs.