Jimmy Fallon hosted Saturday Night Live with friend and frequent collaborator Justin Timberlake acting as musical guest and honorary co-host on Saturday, Dec. 21.

The show began with Timberlake reprising his signature role as a singing salesman for Omeletteville, Veganville, etc. This time, he was singing for people to “Bring It On Down To Wrappinville” with Fallon by his side.

Jimmy Fallon Sings With Paul McCartney

Next, Fallon performed a song monologue, where he spoke about his favorite musical idols, such as Bob Dylan and David Bowie. He was just launching into his best Paul McCartney impression when the Beatle himself came onstage. Fallon and McCartney serenaded the crowd with “Have Yourself A Merry Little Christmas.”

Timberlake Does Jimmy Fallon Impression

Both Timberlake and Fallon had a hard time staying in character during the “Celebrity Family Feud” sketch in which Timberlake impersonated Fallon while Fallon did his best Jim Parsons, of The Big Bang Theory.

At one point, Fallon, known for breaking into fits of laughter during his time as an SNL cast member, was seen ducking under the podium, supposedly to hide his laughter. The sketch also gave other cast members a chance to showcase their celebrity impressions, with Kate McKinnon as Jane Lynch and Jay Pharoah as Ice T.

The duo also brought back “The Barry Gibb Talk Show,” which featured a cameo by Madonna and launched the phrase “skeleton selfie.” The sketch also welcomed another very special guest to the SNL stage (SPOILER: it was a cameo by Barry Gibb himself!)

Timberlake performed “Only When I Walk Away” and “Pair of Wings.”

Other highlights included Mayor Michael Bloomberg, who joined Fallon on the Weekend Update desk, and, arguably the best sketch of the night, the digital short called “(Do It On My) Twin Bed.” The music video about adults going home to their parents’ house for the holidays, and trying to have sex in their childhood bedrooms, stared most of the female cast members and featured a rap break by Fallon.

Thank you SNL. Thank you @jtimberlake. Thank you guys for watching! So fun!!

— jimmy fallon (@jimmyfallon) December 22, 2013

Thank you Paul and Barry and Madonna. I almost can't believe this tweet. #snl #saugertiesdreams

— jimmy fallon (@jimmyfallon) December 22, 2013

Saturday Night Live returns with new episodes Saturday, Jan. 18, with host and musical guest Drake.

– Olivia Truffaut-Wong

Get Uinterview's FREE iPhone App For Daily News Updates here.

Get the FREE Uinterview iPad app here and watch our videos anywhere.

More on Jimmy Fallon, Justin Timberlake and Saturday Night Live:

_{'Saturday Night Live'™ Searches For Black Female Cast Member}

_{Jimmy Fallon To Host 'The Tonight Show' In 2014, Jay Leno Confirms}

_{Seth Meyers Taking Over 'Late Night' Following Jimmy Fallon’s Departure}

_{Justin Timberlake 'The 20/20 – 2 of 2' Review: A Sexy, Sometimes Overwhelming, Disjointed Album}