Hilton was to have been a guest on the late-night show on Nov. 26, but scrapped all planned media appearances promoting her Fox series, "The Simple Life."
At the time, Hilton's spokesman said no slight to Letterman was intended. He added that she wanted to keep a lower profile because of the attention she'd received from her ubiquitous Internet sex video.
The hotel heiress had said she was "embarrassed and humiliated" that a homemade sex video she shot several years earlier with then-boyfriend Rick Salomon had been making the rounds online.
Hilton and her friend Nicole Richie (search), daughter of Lionel Richie, star in "The Simple Life 2: Road Trip," which premieres June 16 on Fox television. It's the sequel to their hit show that chronicled their stay with the Leding family in rural Altus, Ark.