Sigourney Weaver joins Paul June 5, 2009 Alien actress to join Simon Pegg and Nick Frost in Paul Sigourney Weaver has joined the cast of the upcoming comedy pic Paul. The Alien actress will first film a role in Paul, Simon Pegg and Nick Frost’s road trip comedy about two sci-fi geeks who discover an alien (voiced by Seth Rogen) near Area 51. Weaver has also been confirmed You Again. She will play the rich aunt of a woman who is about to walk down the aisle. Kristen Bell will lead the cast as the sister of the groom, who was arch rivals with the bride in high school. She is also expected to reprise her role as Dana Barrett in Ghostbusters 3.