Watch Alanis Morissette and Jimmy Fallon sing Christmas carol in New York subway in disguise

Alanis Morissette joined Jimmy Fallon for some busking in a New York subway station, and we almost didn't recognise her!

The pair performed the classic Christmas carol The Little Drummer Boy, and those who walked by were none-the-wiser as they were both cleverly disguised.

However, the moment Alanis took off the blonde wig she was wearing, fans quickly swarmed and cheered for the Canadian singer has she busted out her iconic hit You Oughta Know, from her 1995 album Jagged Little Pill.

It was kind of epic!

Alanis also revealed The Tonight Show host that her legendary record Jagged Little Pill - celebrates its 25th anniversary next year – was actually rejected by every label.

But it, of course, went on to be amazingly successful – and is now even being turned into a Broadway Musical.