Giffin wrote a follow-up book called "Something Blue," which continues the story from the perspective of the best friend, portrayed in the movie by Hudson.
The extra scene at the end of the credits this weekend showed Hudson and Krasinski in London with the text "To be continued." Warner Bros. says a decision about another film hasn't been made.
"Something Borrowed" came in fourth at the box office with just under $14 million over its opening weekend.
