We hope everything turns out all right for Matt Damon.
The oft-involved actor was forced to pull out of a charity event tonight in San Francisco due to a "family emergency of a serious nature," his rep confirms to E! News.
"He wouldn't have missed this otherwise," she said.
Organizers for the Second Annual OneXOne Fundraiser, which Damon had been scheduled to host, had said earlier today that it's main man couldn't make it.
Charlize Theron and soccer star Mia Hamm are also expected at the gala, which benefits organizations committed to helping children and fighting health crises around the globe. Hamm and Damon are OneXOne ambassadors.
Eyewitnesses spotted Damon and his wife, Luciana, walking in Boston with their daughter Gia and an older couple. The duo are also parents to daughters Isabella and Alexia, Luciana's daughter from a previous relationship.
"He looked mellow," David Feltner, musical director for the Chamber Orchestra of Boston, told E! News.
—Additional reporting by Stephanie Frishberg
(Originally published Oct. 22, 2009, at 4:20 p.m. PT)
Good for Matt and Luciana! Gia, Isabella and Alexia have no place in our gallery of Weirdest Celebrity Baby Names.