Katie Holmes is an actress who became famous for her starring role in the TV show Dawson's Creek.
In 1999, she and her co-star, Joshua Jackson, made a cameo appearance as their Dawson's characters, Joey and Pacey, in Muppets From Space.
Another Dawson's co-star, James van der Beek, also has a Muppet connection -- he appeared in an episode of Aliens in the Family.