Celebrity favorite designer L'Wren Scott just joined Twitter! The designer, whose creations are often worn by Oprah Winfrey (Scott designed the talk show host's finale dress seen at left), Michelle Obama, Amy Adams, Nicole Kidman, and a fleet of Hollywood leading ladies, is happy about her new social media status. "I am officially on Twitter. #Excited," was her first official Tweet. (Great use of a hashtag, we must say!) Follow L'Wren at @lwrenscott. Also new to Twitter: Jason Wu! He launched his own account two weeks ago. Follow the designer @misswu_ny.