Impressive! Christina Aguilera stuns with Cher, Britney vocal impersonation on 'Tonight' with Jimmy Fallon.
Jimmy Fallon makes his first appearance as host of NBC';s "Tonight Show."
"The Tonight Show" returns tonight with a new host and new location.
This weekend the first move of NBC's late night shake up will take place. It's the last show for Saturday Night Live star Seth Meyers before he takes over "Late Night" for Jimmy Fallon next month while Fallon becomes the new host of "The Tonight Show".
Jay Leno and Jimmy Fallon discuss the changes ahead on "The Tonight Show". Leno's last show is next Thursday.
An inside source tells FOX411's Pop Tarts column that there's another famous funnyman in the running for the top job.