On this day 16 years ago, our country was forever changed by horrific attacks on New York City's World Trade Center.
As we continue to learn and grow as a country following the unthinkable terror inflicted on Sept. 11, 2001, we will never forget the brave souls who gave their lives on that truly terrible day.
Scroll down below to see what your favorite celebrities posted in tribute to the victims of 9/11.
We remember everyone we lost on 9/11 and honor all who defend our country and our ideals. No act of terror will ever change who we are.— Barack Obama (@BarackObama) September 11, 2017