(Screenshot via YouTube)

Celebrities expressed their sorrow and condolences over the Orlando shooting this week.

Lady Gaga gave an emotional tribute at a vigil for the victims outside Los Angeles’ City Hall on Monday.

“As we have now witnessed the largest mass shooting in American history, I can’t help but feel that this level of hatred, like all prejudicial crimes, this is an attack on humanity itself. This is an attack on everyone. Tonight, I gather humbly with you as a human being in peace, in sincerity, in commitment, in solidarity, to take a real moment and mourn the tragic loss of these innocent, beautiful people,” Lady Gaga said at the vigil before reading the list of names of the lives lost.

Janet Jackson posted a tribute video for her song “Shoulda Known Better” featuring pictures of the victims combined with news footage.

Shoulda Known Better – Unofficial Lyric Video – Janet Jackson (A Tribute To The Victims of the Orlando Shooting) from ithl23 on Vimeo.

Actor Tituss Burgess performed at the Stonewall Inn rally and vigil for Orlando, singing “Somewhere” from “West Side Story.” Nick Jonas also spoke at the vigil.

Other celebrities took to Twitter and Instagram to share their thoughts.

Deeply moved that in the face of tragedy Orlando & Americans everywhere are coming together to give blood, love & support.This is who we are

— Laverne Cox (@Lavernecox) June 12, 2016

my love for the LGBTQ+ community goes on and on and on, i will grieve today and i will fight tomorrow — Olly Alexander (@alexander_olly) June 12, 2016

My heart is broken. Let people be people, let’s love together. The world is with you Orlando ❤️ pic.twitter.com/pH5tBYn60o

— Sam Smith (@samsmithworld) June 13, 2016

Heartbroken about the shooting in Orlando. My prayers and thoughts are with you all in America. I pray for this world to change! — Boy George (@BoyGeorge) June 12, 2016

The tragedy in Orlando is just beyond sad. My deepest regrets to all those suffering. There are no words that suffice. I’m…stunned. — Neil Patrick Harris (@ActuallyNPH) June 12, 2016

  Stop Hate. Stop Violence. ❤️❤️❤️❤️❤️❤️#revolutionoflove   A photo posted by Madonna (@madonna) on Jun 12, 2016 at 4:31pm PDT

Woke up in tears to hear the news about Orlando. Devastated, heartbroken, sick. I played there last Friday and last night I performed after Pride in LA. From the Dj booth you see laughter, love, dancing freedom and beautiful people living their lives not harming anyone. It’s one of the beautiful things to see from stage. This horrific tragedy has me on my knees at the mercy of a greater power to ask the simple question of “When will this end”… I’m praying for Orlando, I’m crying for Orlando and I am there with you in spirit sending my love and strength. A photo posted by Ruby Rose (@rubyrose) on Jun 12, 2016 at 11:29am PDT

My heart goes out to the victims and their families. Our community has suffered a tremendous loss. We must stand together more than ever. — Ellen Page (@EllenPage) June 12, 2016

NO WORDS GOOD ENOUGH?‼️WHEN UR HURT, WOUNDED, MURDERED WE ALL CRY‼️WE ALL MOURN ‼️WE R ALL LESS WITHOUT U MY EXTENDED FAMILY??‼️#URNOTALONE — Cher (@cher) June 12, 2016

There is something profoundly wrong with a nation that allows its citizens to be slaughtered the way we have. We are ill. Maybe terminally. — Bette Midler (@BetteMidler) June 13, 2016

My heart is heavy today, but I still believe in love. There’s more love than hate in this world. #OrlandoUnited — Ellen DeGeneres (@TheEllenShow) June 13, 2016