Lindsay Lohan sat down with David Letterman on the Late Show Wednesday and decided to have a little fun and give Oprah Winfrey a prank call. Oprah answered to Letterman posing as a high-pitched “secretary” and had no idea who she was talking to. 

Watch as Oprah tries to figure out who is on the other line and dishes on how she feels about Lohan’s progress in her struggle with sobriety. 


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