Today on Twitter, many music celebs used their tweets to remember the late Aaliyah, who died in a plane crash on Aug. 25, 2001. Keri Hilson was especially affected by the singer's death, and a decade later, shared her sadness through a series of tweets. Diddy also reached out to tweet his "rest in peace" message, as did Nick Cannon and Estelle. Also on Twitter today, Justin Bieber announced his plans to record a Christmas album, while 'American Idol' winner Scotty McCreery and 'The Voice' runner-up Dia Frampton talked about getting into shape. See what your favorite stars were tweeting about today!