Savannah Guthrie is still having a hard time with Matt Lauer's firing.
A source tells ET that the Today co-anchor "is affected the most" by the news that Lauer was fired by NBC for alleged inappropriate sexual behavior.
Guthrie, who was emotional as she made the announcement of Lauer's termination on-air on Wednesday, is "still processing everything," the source says, adding that she and Lauer, who co-anchored Today together since 2012, "were close personally and professionally."
"She’s not herself. She’s visibly shaken," the source continues, explaining that around the studio on Thursday morning, Guthrie appeared "sad, in deep thought and preoccupied" off-camera. "She is doing her best to stay upbeat and jolly on-air."
Lauer was fired by NBC on Wednesday after the network received a "detailed complaint" about his behavior from a colleague. Though NBC claimed it was "the first complaint about his behavior" in his more than 20 years of employment at NBC, several more accusers have come forward with stories published in Variety and The New York Times.
Lauer broke his silence on the allegations on Thursday, apologizing to the "the people I have hurt."
"As I am writing this I realize the depth of the damage and disappointment I have left behind at home and at NBC. Some of what is being said about me is untrue or mischaracterized, but there is enough truth in these stories to make me feel embarrassed and ashamed," he said in a statement. "I regret that my shame is now shared by the people I cherish dearly. Repairing the damage will take a lot of time and soul searching and I’m committed to beginning that effort. It is now my full time job."
"The last two days have forced me to take a very hard look at my own troubling flaws. It’s been humbling. I am blessed to be surrounded by the people I love. I thank them for their patience and grace," he concluded.
See more in the video below.