Celebrity Celebrities Remember 9/11 on 15th Anniversary of Terror Attacks Celebrities from Oprah to Lady Gaga shared their tributes to the victims of the terror attacks of September 11 By Stephanie Petit Stephanie Petit Stephanie Petit is a Royals Writer and Reporter at PEOPLE. People Editorial Guidelines Published on September 11, 2016 04:15 PM Share Tweet Pin Email Photo: Albin Lohr-Jones/Pacific Press/LightRocket/Getty Images On the 15th anniversary of the September 11 terrorist attacks, celebrities around the world are honoring the nearly 3,000 people who were lost in the tragedies that occurred on that day. Some, such as Saturday Night Live actor Pete Davidson, were directly impacted by the attacks. Davidson lost his father, a New York City firefighter, in the attacks on the World Trade Center when he was just 7 years old. In an Instagram posted on Saturday, Davidson shared a photo of his younger self with his dad sipping on some Heineken beer. He captioned the photo, “Can’t believe tomorrow is going to be 15 years. Missing the legend !!! Thank u all for ur kind words and support as always #werememberthem.” Hollywood’s biggest stars from Lady Gaga to Ryan Seacrest shared tributes to the lives that were lost 15 years ago and to the heroes who sacrificed everything to help others survive. Presidential candidates Hillary Clinton and Donald Trump attended a 9/11 Memorial Service at Ground Zero in downtown Manhattan Sunday morning. Although Clinton had to leave early due to the heat, her campaign shared that she recuperated at her daughter Chelsea’s apartment and was feeling much better later in the day.