Breakfast Links: Katy Perry Gets Proactiv; Tom Hanks Joins Twitter

•Katy Perry is the new face of Proactiv, along with Avril Lavigne (Popcrunch)

•Ivan Reitman, the original Ghostbusters director, has signed up for the upcoming third movie. (MTV)

•Tom Hanks prepares to communicate using 140 characters or less. (Twitter)

•Kiefer Sutherland wore a dress to appear on the Late Show with David Letterman last night. (Popeater)

•Portuguese soccer champ Cristiano Ronaldo shows off his 10-pack as the new, um, face of Armani. (Daily Mail)