Wow. It's hard to believe it's been 14 years since that fateful day in New York City.
Although many hardworking men, women, and children tragically passed too soon, we still celebrate their lives every year — and we're not alone.
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Many of Hollywood's biggest stars have taken to social media, posting touching tributes in remembrance of September 11, 2001.
So get ready to feel the love today and ch-ch-check out what stars like Beyoncé, Amy Schumer, and more are saying on Instagram, Twitter, and Facebook (below).