Ashton Kutcher's love life is about to get even more interesting -- at least for the character he plays on the Fox hit "That '70s Show." Shannon Elizabeth is set to guest star in two episodes of the comedy series with an option for another two. She will play a new love interest of Michael Kelso (Kutcher). The hit comedy from Carsey-Werner-Mandabach is returning for a sixth season in the fall. Elizabeth's gig on "That '70s Show" extends her relationship with Fox after she signed a talent holding deal with the network in the fall. In addition to her turn as Czech exchange student Nadia in the two "American Pie" movies, Elizabeth has appeared in such features as "Scary Movie" and "Jay and Silent Bob Strike Back." The actress, who most recently co-starred in the CBS telefilm "Crooked E: The Unshredded Truth About Enron," will next be seen in the features "Love Actually," "Johnson Family Vacation" and Wes Craven's "Cursed." Elizabeth is repped by ICM, manager Steven Fenton and attorneys Marcy Morris and Jeff Bernstein.