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Boston-born-and-bred celebrities are rallying around their city on social media about Monday's explosions at the Boston Marathon.

"Such a senseless and tragic day. My family and I send our love to our beloved and resilient Boston," Ben Affleck wrote on Facebook Monday.

Also on Monday, Mark Wahlberg tweeted, "Thoughts and prayers with my hometown Boston today."

But by that evening's New York City premiere of his latest film, "Pain and Gain," the star was in a somber mood.

"I really didn't even want to come tonight. I hadn't really heard much. I spoke to my mom, and most of my family seems to be OK. It's such a big event, there's so many people there. It's horrible man. It's (expletive) disgusting, man. I just - I'm very upset," Wahlberg told reporters on the red carpet Monday night.

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New Kids on the Block's Joey McIntyre, who was running in the Boston Marathon Monday, tweeted after missing the explosions by minutes.

"There was an explosion by the finish line about 5 minutes after I finished- I'm ok but I'm sure there are many hurt," he quickly tweeted.

Later, he wrote: "I don't know what to say. I feel for everybody involved with the Boston Marathon. My family is ok. I am ok. Gonna take a while to process."

McIntyre's bandmates, Jordan Knight and Donnie Wahlberg, had also tweeted fans to let them know McIntyre was uninjured.

"Just heard that @joeymcintyre is ok! Thanks to everyone for tweeting! Scared for everyone else in Boston.#PrayerForBoston please," Donnie Wahlberg wrote.

Later the older brother of Mark Wahlberg tweeted: "No words to describe the pain in my heart, at this moment, in seeing my city torn apart this way. So sad. Please #pray4boston & the victims."

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Mindy Kaling, who was born in Cambridge, Mass., tweeted, "My heart aches for my hometown."

The comedian, who plays a doctor on her show, "The Mindy Project," also gave a shout out to "the many worthy Boston area hospitals who are helping the wounded, St. E's, Mass General, Beth Israel and many more."

Her former "The Office" co-star John Kraskinski, who was born in Newton, Mass., tweeted: "My heart and prayers are in Boston and with everyone affected by this nightmare of an incident."

"Extra" host and Medford, Mass., native Maria Menounos tweeted: "keep getting overwhelmed w/tears. the photos are devastating. god bless those affected & our first responders. love u boston my heart is w/ u all."

Later, Menounos defended her decision to fly to Boston to cover the tragedy's aftermath for "Extra" after Twitter user Rob Chase accused her of exploiting "a horrible situation."

After Chase questioned whether Menounos' report would come before or after a story on Kim Kardashian's weight gain, Menounos responded, "u are obviously and angry person to be spending your time challenging my credentials.im done"