It's time to get back to work for the Glee stars.
Despite still mourning Cory Monteith's death, production for season five has kicked off.
"Today was first day back," a source from the show told E! News. "Last week was rehearsals but today was first official day of production on new season. Everything went as well as it could have. Very emotional but everyone is starting to move forward. Getting back on track."
Another source from production added, "It was business as usual."
Lea Michele, who was spotted leaving a sound studio in Hollywood today, tweeted earlier, "Couldn't have picked a more beautiful & perfect song to start the year with.."
Co-creator Brad Falchuk noted Monteith's missed presence, posting a photo of the empty classroom with a tweet that read, "Day one season five. Something very big missing but everyone is happy to be together and back to work."
"Day 1. ," Kevin McHale tweeted, "thanks for the TT u guys :) ," while Jenna Ushkowitz wrote, "...here we go!"
Darren Criss also tweeted, "Annnnnnnnnd back to work."
Meanwhile, Chris Colfer told HuffPost Live, "It's difficult because it's hard to mourn someone, but it's another thing to mourn someone with the world."
He continued, "I think a line needs to be drawn, because it's really unnerving to get messages from people, from 12-year-olds in Nebraska telling you how to mourn and telling you how to pay your respects."
FOX Entertainment Chairman Kevin Reilly recently revealed that Finn's death will be connected with the late actor's troubled past.
"The third episode will write Finn out of the show. That episode will deal directly with the incidents involved with Cory's passing and the drug abuse in particular," he said, though Reilly wouldn't confirm that Finn would die from drug overdose.
—Reporting by Holly Passalaqua