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Jimmy Fallon's 'Late Night' hits

As Jimmy Fallon prepares to take over the helm of "The Tonight Show," take a look back at nine of his funniest moments on “Late Night,” including his dead-on Neil Young musical impression.

As Jimmy Fallon prepares to take over the helm of "The Tonight Show," take a look back at nine of his funniest moments on "Late Night."

Slow Jamming the News with President Obama
In April 2012, President Obama helped Fallon and Tariq "Questlove" Trotter slow-jam the news. Lloyd Bishop / NBC
In February 2013, Brooke Shields (second from left) helped Jimmy Fallon spoof "Downton Abbey" in a sketch called "Downton Sixbey" (named after Studio 6B in 30 Rock, the home of "Late Night"). Lloyd Bishop / NBC
Jimmy Fallon is known for his dead-on musical impressions, including an uncanny imitation of veteran rocker Neil Young. Tracy Leeds / NBC
One of Fallon's cleverest characters is "Tebowie": a mash-up of rocker David Bowie and quarterback Tim Tebow. Here Tebowie appears in Ziggy Stardust regalia in March 2012. Nbc / NBC
Jimmy Fallon and Rachel Dratch parodied MTV hit "Jersey Shore" with "Jersey Floor," set on a magical floor of 30 Rock inhabited by young New Jersey Italian-Americans. Here they are joined by real "Jersey Shore" cast members in September 2011. From left: Jennifer "JWoww" Farley, A.D. Miles, Dratch as "Drootchie," Fallon as "J Bro," Nicole "Snooki" Polizzi, Deena Nicole Cortese and Sammi Giancola. Lloyd Bishop / NBC
Aided by house band The Roots, Fallon (left) and Justin Timberlake perform the fourth installment in their acclaimed "History of Rap," a bravura medley of hip-hop classics, in March 2013. Ira James / NBC
In March 2013, first lady Michelle Obama joined a bewigged Jimmy Fallon to perform "The Evolution of Mom Dancing," featuring such moves as the hip bump. Lloyd Bishop / NBC
In December 2012, Mariah Carey joined Fallon and The Roots to perform a special rendition of her holiday hit "All I Want For Christmas Is You" using classroom instruments. Nbc / Lloyd Bishop/NBC
In July 2012, Charlie Sheen joined Fallon on "Late Night." The "Major League" star and Fallon stepped into a batting cage for some friendly competition. Lloyd Bishop / NBC