In this Tuesday, April 9, 2013 photo released by CBS Entertainment, actress Lindsay Lohan talks to David Letterman about her upcoming trip to rehab, her guest star roles in the series "Anger Management" and film "Scary Movie 5" and more during the "Late Show with David Letterman," (11:35 PM-12:37 AM, ET/PT) on the CBS Television Network, in New York. (AP Photo/CBS Entertainment, Jeffrey R. Staab)LOS ANGELES (AP) — Lindsay Lohan is going into rehab next month, but first she needed to face David Letterman.