Many of us are old enough to remember the 1976 version of A Star Is Born starring Barbra Streisand and Kris Kristofferson. Well, over the weekend both singers were part of the British Summer Time festival in London’s Hyde Park, and during Streisand's set, Kristofferson reunited with his co-star to sing the duet “Lost Inside of You,” from the 1976 film. See it below.