Aniston launched her Instagram account at around 6 a.m. PT Tuesday morning. By 5 p.m. PT, she has amassed 4.5 million followers. That's more than Courteney Cox's 4.1 million, Lisa Kudrow's 3.4 million, Matt LeBlanc's 3 million and David Schwimmer's 2 million. (Matthew Perry doesn't have an Instagram, but he has a Twitter account with 1.4 million followers.) Meanwhile, Schwimmer welcomed Aniston with a photo of Lego Ross and Rachel.