From the sunny shores of ""The OC,"" MISCHA BARTON heats up the ""Live"" studio. CLAY AIKEN shares stories from his new book ""Learning to Sing: Hearing the Music in Your Life."" And she's back with a seductive new soap-""Desperate Housewives'"" NICOLETTE SHERIDAN visits ""Live"" today. ""Live's"" DREAM TEAM AMBUSH MAKEOVERS continue with another unbelievable transformation and another viewer attempts to set a mark in the GUINNESS BOOK OF WORLD RECORDS.