Shay Astar

Shay Astar  (born 29 September 1981) is an American actress, singer, and songwriter, perhaps best known for her work in the late 1990s, portraying August Leffler, a semi-recurring character on the sitcom 3rd Rock from the Sun. Astar portrayed an imaginary friend named Isabella in the Star Trek: The Next Generation episode "Imaginary Friend" in 1992.

Description above from the Wikipedia article Shay Astar, licensed under CC-BY-SA, full list of contributors on Wikipedia