The Rolling Stones' Ronnie Wood has reportedly entered rehab for a drinking problem. "Following Ronnie's continued battle with alcohol he has entered a period of rehab," Wood's spokeswoman said. "His close family and friends say he is seeking help and look forward to his recovery." Wood's struggle with substance abuse has been well-documented; one time, his drug use was so bad that Keith Richards (of all people) had to persuade Wood to get sober, sometimes using a knife or gun. Wood also admitted last year that his wife and Mick Jagger recommended he enter rehab prior to the Stones' 2002 tour.