WATCH: Sam Smith on the Tonight ShowDid you see Sam Smith perform on the Tonight Show? SWOOON! So good! Watch "Too Good at Goodbyes" here!
Maroon 5 Busk in New York Subway with Jimmy FallonFallon previously pulled the same subway stunt with Miley Cyrus and U2.
WATCH: Jinglebash Artist Taylor Swift on The Tonight ShowShe wasn't scheduled to be there - but that's how she rolls! Check out Taylor Swift singing "New Year's Day" on the Tonight Show last night!
P!nk Sings Fall-Themed #Hashtag Songs On 'Fallon'“Fall is here to remind you/ of the allergies you thought went away."
Miley Cyrus and Jimmy Fallon Photobomb NYC VisitorsCyrus and Fallon popped into view with props including umbrellas and a giant hotdog.
Watch Demi Lovato & Jimmy Fallon Have a 'Lip Sync Conversation'The exchange featured lyrics from Adele, DJ Khaled, Ed Sheeran, Miley Cyrus and more.
WATCH: All #HandInHand Benefit Performances & Celeb SpeechesClick here to watch Beyonce, Justin Bieber, Demi Lovato, Luis Fonsi, Blake Shelton & more at the #HandInHand benefit.
WATCH : Luis Fonsi on The Tonight ShowLuis Fonsi was on the Tonight Show last night! Check out his performance here and see how he came up with the song "Despacito"!
WATCH : Kesha on The Tonight ShowDid you see Kesha performing "Praying" on the Tonight Show? Grab the tissues and watch here! SO GOOD!
Justin Timberlake Returns to Camp Winnipesaukee with Jimmy FallonThe two sing 4 Non Blonde's hit song "What's Up" and Gloria Estefan's "Rhythm Is Gonna Get You."
WATCH : Bebe Rexha and Louis Tomlinson on The Tonight ShowDid you catch Bebe Rexha and Louis Tomlinson on The Tonight Show last night? AMAZING! Watch here!
WATCH : Ellie Goulding and Kygo on The Tonight ShowDid you see Ellie Goulding and Kygo performing together for the first time on Jimmy Fallon? It's was "First Time" - get it? :p Watch here!