Grace attends a holiday party at Will's mother Marilyn's home and accidentally breaks a treasured Lladro figurine. Will convinces Grace not to tell his mother and to blame the accident on one of the other guests at the party. Elsewhere, Karen's stepdaughter, Olivia, comes to stay for the Christmas holiday. While lunching at the mall they start making fun of people, but Karen's remarks are especially mean and Olivia and her friends take offense. Paolo Presta, who won a guest appearance on "Will & Grace" from Oprah on her "Oprah's Wildest Dreams Show,".