But celebrities haven't raised the rallying cry that they did after 2010's Haiti earthquake and 2005's Hurricane Katrina. As of Tuesday morning, no plans for a large scale benefit concert, telethon, or similar fundraising event had been reported.
When ABCNews.com asked representatives for Sean Penn if the Oscar-winning actor, who quickly latched on to relief efforts in Haiti and New Olreans, planned to do anything for Japan, they responded, "Mr. Penn continues to participate in relief efforts in Haiti."
So far, the extent of stars' efforts has been beseeching their Twitter followers to donate to organizations like the Red Cross.
Sheen took a break from his own troubles Friday to tweet his concern for the quake and tsunami victims, writing, "Curveball; Warlock edict; pain & devastation in Japan demands us all to dig deep & LOVE THEM VIOLENTLY Dogspeed my cadres of the Far East! C"
P. Diddy expressed his shock in similar fashion: "Oh man yall see this earthquake in japan??????!!!!!! Let us pray!!!! God bless Japan!"
On Friday and through the weekend, stars flooded Twitter with prayers. For A-listers, the news of the quake hit especially close to home -- many of them do publicity and perform in Japan.
"My prayers and love is with all of those in Japan. Wow my heart is breaking with every image I see. So sad! Praying hard!" Khloe Kardashian tweeted.
"So devastating to hear about the huge earthquake and tsunami Japan. My thoughts and prayers are with everyone there," "Glee" star Lea Michele wrote.
Back from a recent tour stop in Japan, Katy Perry wrote, "My prayers go out to anyone that is being effected by the disaster in Japan ... #prayforjapan."
Perry reiterated her message Sunday night: "Imagine... if we ALL texted REDCROSS to 90999 we'd have raised over 60million dollars for #JAPAN REFLIEF! BE THE CHANGE YOU WANT TO SEE! BE!"