NBC is to officially confirm Jimmy Fallon’s move to “Late Night” during a news conference Monday, replacing longtime host Conan O’Brien.

The much talked about change at NBC’s “Late Night” talk show is about to be confirmed by the network. “A person close to the negotiations” spoke to the Associated Press on condition of anonymity Sunday, saying a news conference was planned for Monday, when NBC is to hold its “upfront” presentation to advertisers in New York.

“Saturday Night Live” alum Jimmy Fallon will step in Conan O’Brien’s shoes as host of the late-night talk show, while O’Brien will move to Los Angeles to take over hosting duties from Jay Leno on the “The Tonight Show.”

The 33-year-old Fallon was a cast member on “Saturday Night Live” for six seasons. He became famous for his impersonations, song parodies and for frequently breaking into laughter during a sketch, a tendency which made him even more endearing among fans and annoying among critics.

His part in “SNL” was nevertheless a success and he eventually co-anchored “Weekend Update” with Tina Fey. Fallon left the show in 2006, but made several guest appearances afterwards.

After leaving “SNL” Fallon tried his comedic skills in movies, portraying a goofy Boston Red Sox fanatic who falls in love with Drew Barrymore’s character in “Pitch Fever,” and a ditzy police officer with a knack for sabotaging operations in “Taxi,” alongside Queen Latifah. His latest big screen appearance is 2006’s “Factory Girl.”

Jimmy co-hosted the 2001 MTV Movie Awards with Kirsten Dunst and went on to host the MTV Video Music Awards in 2002 and the MTV Movie Awards in 2005.

In 2009 he becomes the third host of “Late Night,” after David Letterman and O’Brien. He signed a deal with NBC in 2007 which secured his television work exclusively for the network.