Hoda Kotb's slipping into Matt Lauer's old chair after being named the "Today" show co-anchor.
NBC made it official Tuesday morning ... and Hoda and her new partner, Savannah Guthrie, breathlessly announced it at the top of the show.
Back on Nov. 29 ... Hoda and Savannah dropped the shocker that the Peacock had fired Matt Lauer over sexual harassment claims made by more than a dozen women.
Hoda's workload just skyrocketed ... in addition to replacing Matt, she'll also keep her gig co-hosting with Kathie Lee Gifford for the 4th hour of 'Today.'