PREVIEW: The guests wreak havoc at Lexie's baby shower; Shawn makes Belle jealous; an engagement is announced! SUMMARY: Brandon and Sami run into Lucas and Will in the apartment corridor and Sami announces her engagement. Will is happy because he really likes Brandon and wishes Lucas would marry Denise. Lucas is forced to admit he broke up with Denise; Brandon takes Will upstairs to a play date and Sami takes the time to rub her happiness in Lucas's face. Lucas is confident Sami will screw it up with Brandon and tries to cool down by calling Nurse Deb. Meanwhile, Brandon returns to have a play date of his own with Sami, but she freaks when he tells her that Lexie is having a baby shower and he heard about it from one of the invitees -- Eugenia! Marlena, Hope, Jennifer and Maggie throw a small baby shower for Lexie at Tuscany. Eugenia arrives a little late and feels uncomfortable, given the circumstances. Sami crashes the shower and is relieved to find out that Eugenia hasn't said any