Roger Ebert passed away today at the age of 70. He announced on Tuesday that he was taking a "leave of presence" from his movie reviewing after discovering his cancer had returned following a hip fracture. Being one of the most popular film critics of our time, Roger had touched many celebrities' lives over the past five decades. Read on to hear how stars like Oprah Winfrey, Barack and Michelle Obama, Tom Cruise and more celebrities are reacting to the tragic news. He will be missed.