Tuned a half step down - Eb Ab Db Gb Bb Eb
For C and Em add9 chords, use your pinkie to alternate 
on the high E between open and 3. Listen to the song for the rhythm.

  [C]
I really can't stay
(but baby it's cold outside)
  [Em add9] 
I've got to go away
(but baby it's cold outside)
  [C]
This evening has been
(been hoping that you'd drop in)
  [Em add9]
So very nice
(i'll hold your hands, they're just like ice)
   [F]
My mother will start worry
(beautiful whats your hurry)
   [Am]
My father will be pacing the floor
(listen to the fireplace roar)
   [Dm] 
So really i'd better scurry
(beautiful please don't hurry)
   [G]
but maybe just a half a drink more
(put some records on while i pour)
   [C]
the neighbors might faint
(baby it's bad out there)
   [Em add9]
say what's in this drink
(no cabs to be had out there)
   [C]
i wish i knew how
(your eyes are like starlight now)
   [Em add9]
to break this spell
(i'll take your hat, your hair looks swell)
   [F]
i ought to say "no, no, no sir"
(mind if i move in closer)
   [Am]
at least i'm gonna say that i tried
(what's the sense in hurtin' my pride)
   [Dm]
i really can't stay
(oh baby don't hold out)
               [G]  [B] [C]
both:baby it's cold out side