Stephenie Meyer, Author of Twilight & The Host, Reveals Weight Loss
03/21/2013 AT 11:30 AM EDT
Wearing a floral dress, a black cardigan and bold red lipstick, Meyer, 39, showed off her dramatic weight loss at Tuesday's Hollywood premiere of The Host, based on her 2008 science-fiction romance novel.
"It's kind of an alien love story," director Andrew Niccol has told PEOPLE.
The movie – due to hit theaters March 29 – stars Saoirse Ronan as Melanie, one of the world's last remaining free spirits.
As an alien named Wanderer assumes control of Melanie's soul, Melanie's remaining emotions still draw her to a handsome human named Jared (Max Irons).