This is my version of the song, and it fits perfectly when you play along to the studio 
version. Another version of the chords were right when I played along to the live one, 
but it sounded all wrong to this one, so I re-made it :)

[All copyright goes to Justin Bieber and Island Def Jam - I only tabbed it out!]


A                                   E
It?s the most beautiful time of the year
                                              F#m
Running through the streets spreading so much cheer
                                  D
I should be playing in the winter snow

But I'mma be under the mistletoe

A                                   E
Word on the street Santa's coming tonight,
                                F#m
Reindeers flying in the sky so high
                                  D
I should be playing in the winter snow
                               A
But I?mma be under the mistletoe

                      E
With you, shawty with you
                      F#m
With you, shawty with you
                   D
With you under the mistletoe

(KEEP IT UP THROUGH THE REST OF THE SONG)
Gathering around the fire
Chestnuts roasting like a high tonight
I should be playing in the winter snow
But I?mma be under the mistletoe

I don?t want to miss out on the holiday
But I can?t stop staring at your face
I should be running in the winter snow
But I?mma be under the mistletoe

With you, shawty with you
With you, shawty with you
With you under the mistletoe

With you, shawty with you
With you, shawty with you
With you under the mistletoe

Hey love, the wise men followed a star
Like I am following my heart
And it lead me to a miracle
Hey love, don't you buy me nothing
Cause I am feeling one thing
Your lips on my lips
That's a merry merry christmas

It?s the most beautiful time of the year
Flying through the streets spreading so much cheer
I should be playing in the winter snow
But I?mma be under the mistletoe

I don?t want to miss out on the holiday
But I can?t stop staring at your face
I should be playing in the winter snow
But I?mma be under the mistletoe

With you, shawty with you
With you, shawty with you
With you under the mistletoe

With you, shawty with you
Shawty with you, under the mistletoe

Kiss me under the mistletoe
Show me baby that you love me so
Ohhhh, ohhh,
Kiss me underneath the mistletoe, oh, whoaaa