The singer fought back tears as she spoke about the tragedy – which took 22 lives – and also asked for a moment of silence before she continued.

WATCH: Katy Perry Talks Manchester Tragedy, Shares Message of Love With Ariana Grande Fans

"This week has been really hard. It sucked. It was hard for you guys and it was hard for me because we all love music," she said in a video posted online. "We all listen to the same music, and you think about it, and think that's my friend, that's my sister, that's my brother, that's my cousin, that's the person that loves music."

"It's awful, and whatever you can do to help, you should," she added. "And if you can't do anything that's fine, but what you should do is not let them win. I'm going to sing this next song for them. They can never take that part from us ever. Ever. Can we have a moment of silence before we start? Let's do this."

Katy dedicated Part Of Me to the #ManchesterAttack victims at the #WaterRats show & asked for a moment of silence: pic.twitter.com/WLxzZxHDR0