April 10, 2014 12:05 PM EDT

Lindsay Lohan has Oprah on speed dial — and the recovering starlet proved it on last night’s The Late Show, cold-calling the former talk show host and putting her live on the air with David Letterman.

Oprah was a good sport, and talked with Letterman about his departure from the show. When the subject changed to Lindsay’s docu-series being produced on Oprah’s OWN network, the Queen of TV talk praised Lohan’s openness about her rehab and said she was “doing okay,” bringing a tear to Lindsay’s eyes.

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