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In case you've been buried in work or living under a rock today, it's the 50th anniversary of Rev. Dr. Martin Luther King, Jr.'s famous, iconic, and powerful "I Have a Dream" speech. This landmark moment in the Civil Rights Movement struck a chord with the American people now, and it's still ringing.

Celebs have joined in the discussion about today's events and Dr. King's legacy, whether reflecting on the state of the country, sharing inspiration, or discussing civil rights. Read on to see some of those reactions.

Tyra Banks

The America's Next Top Model host remembers memorizing the Dream speech in school.

Shay Mitchell

The Pretty Little Liars actress shares a powerful quote.

John Cusack

John reminds us that MLK wasn't only about racial equality.

 Oprah

Oprah is hanging out in Washington, DC to celebrate the anniversary!

Aubrey O'Day

The Danity Kane singer is moved by MLK's words.

Kellen Lutz

The Twilight Saga actor reminds us that there's a lot of work left to be done.

Macklemore

The "Thrift Shop" rapper is inspired by Dr. King.

The Jonas Brothers

Kevin, Joe, and Nick remind us to be kind to one another.

Taye Diggs

Taye had a real enthusiastic reaction to President Obama's speech today.

Kerry Washington

The Scandal actress Kerry feels "humbled" and "grateful."

Chrissy Teigen

The often-uncensored model and fiance of John Legend knows when to be serious.

Bethenny Frankel

The former Real Housewife feels inspired today.

Alyssa Milano

Alyssa reminds us of one of Dr. King's other iconic works.

Kelly Osbourne

The Fashion Police judge shares everyday wisdom from Dr. King.