Despite their high profile statuses, celebrities took the time to tweet their prayers for victims and those impacted by the terrorist attacks that took place on U.S. soil 11 years ago.
Michael Phelps, 18-time Olympic gold medalist, took to Twitter to pledge that he would never forget the estimated 3,000 people killed in the attacks on the World Trade Center in New York City and the Pentagon in Arlington, Va.
"Thoughts and prayers for those who lost loved ones... #911 #NeverForget," the 27-year-old Olympic swimmer tweeted.
Natalie Grant, gospel singer, expressed disbelief that 11 years have passed since the nation fell subject to terrorist attacks.
"Hard to believe its been 11 years since that dreadful day," Grant tweeted on Tuesday morning. "Today, I will remember our 9/11 heroes and pray for their families."
Although the terrorist attacks took place in the U.S., some international celebrities expressed their condolences. Kelly Osbourne, British fashion designer, singer and actress, took to Twitter to offer her prayers and well wishes to those affected by the tragedy.
"My thoughts and prayers are with all the families that lost loved ones on #911," Osbourne tweeted. "It might have been 11 years but we never forget our loved ones!"
Jah Cure, a reggae musician from Jamaica, also expressed his sympathies and prayers for those who suffered on 9/11 in a country considered foreign to him.
"Today, let us celebrate the people who risked their lives to save others and pray for the families who lost their loved ones on 9/11," the musician tweeted.
Drita Davanzo, a cast member on the reality television show "Mob Wives," used her Twitter account to solicit prayers from others.
"Take a moment and pray today/honor those who gave their lives 2 protect others 11 yrs ago today (SIC)," Davanzo tweeted on Tuesday morning. "God Bless every1 that lost a loved 1 #RIP."
Russell Simmons, music mogul and entrepreneur, seemed to follow Davanzo's sentiment's on the 11th anniversary of Sept. 11.
"Prayers for the victims of 9/11 and their families," Simmons tweeted Tuesday.