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President Barack Obama, first lady Michelle Obama, Vice President Joseph Biden, Jill Biden

Alex Wong/Getty Images

Today marks the 12th anniversary of the tragic events that took place on September 11, 2001.

President Barack Obama observed a moment of silence in honor of the lives lost during the terrorist attacks on the U.S. early Wednesday morning. He was joined by Michelle Obama, Vice President Joe Biden and his wife Jill on the South Lawn of the White House.

"Together we pause and pray," he later said at a ceremony held at the Pentagon. "We pray for the memory of all those taken from us. Our hearts still ache for the futures snatched away."

And much like the president and the rest of us, celebrities are sending their thoughts and prayers to those who have been affected by the horrific events.

Here is what some of Hollywood is saying via Twitter.

Harry Styles: "Love and prayers to anyone affected by 9/11. We will never forget."

Lea Michele: "My thoughts and prayers go out to those who lost loved ones on 9/11… My heart goes out to you… #NYstrong"

Miley Cyrus: "Do a good deed today in observation of @911day. Make your pledge at 911day.org #911day"

Lady Gaga: "12 years ago today Sept 11th. We Will Never Forget. Still remember the smoke in the sky. Saying lots of prayers for families who lost lives."

Ellen DeGeneres: "Every year on this day, my heart goes out to all the people whose lives were changed forever. #Honor911"

World Trade Center Memorial

Mary Altaffer-Pool/Getty Images

Demi Lovato: "My prayers are with the friends and families who lost loved ones on this day 12 years ago…#9/11 #NeverForget"

Eva Longoria: "America Remembers 9/11 God Bless America!"

Mariah Carey: "Listening to #OneSweetDay in honor of those lost on 9/11/01 w/ deepest sympathy for their loved ones as we ALL continue to heal #Remember911"

Alec Baldwin: "September 11, 2001"

Diddy: "Our Heroes! United We Stand as we Remember 9-11"

William Shatner: "Taking a moment to remember those who lost their lives on this day."

Rosie O'Donnell: "The reading of names – so hard to watch – to feel"

Kris Jenner: "Remembering all those who lost their lives 12 years ago today. #GodBlessAmerica"

Kaley Cuoco: "#neverforget forever standing tall! #9/11"

Alyssa Milano: "#neverforget"

Lucy Hale: "Honoring and remembering today. Can't believe it's been 12 years."

Christina Applegate: "Remembering"

Kelly Rowland: "My thoughts and prayers are still with the families affected by 9/11."

Brody Jenner: "Remembering all who lost their lives 12 years ago on this day and all of our troops .. United We Stand"

Josh Groban: "#neverforget"

JWoww: "Never forget"