Many celebs, like Rob Lowe, took to Twitter today to remember 9/11.

Here are many that we found:

I'll never forget. I was there. #NeverForget #september11 #911Memorial @Sept11Memorial

A photo posted by JW Cortés (@jwcortes) on

https://twitter.com/JLo/status/377680114810507264/

My view…Long live NY

A photo posted by Richard Marx (@therichardmarx) on

https://twitter.com/JackeeHarry/status/377801446873628672

https://twitter.com/DAVIDMDRAIMAN/status/377804324677890048

Also, actor Denis Leary remembered “three good men who died that dreadful day.”