I started playing the ukulele because of this song. I googled all over for a satisfactory tab, but none of them seemed to be exactly right.

I pieced this tab together from the tabs I found and from watching a couple of videos on YouTube.

          
          "Tonight You Belong to Me" as played by
          Steve Martin and Bernadette Peters in "The Jerk".
          Tab by Andrew Otto
          
          Notes:
          
          While playing the bridge, he varies between Cm 
          and Gmaj7 by sliding the Cm bar down one fret 
          then back up.  When changing from G to E7, he does 
          a fancy walk down with the G chord.  The last two 
          down/up strums at the end of that measure slide down
          to F# and then F before changing to E7.  It's
          kinda tricky, and the song will sound fine
          without it if it is too hard.
          
          
          
          Chords:
           G  G7sus  G7 Cmaj7 Am7 Cm/M7 Cm6   D   Cm  Gmaj7  E7   A7
          -2----3----2----2----0----2----0----0(5)-3----2----2----0---------
          -3----1----1----0----0----3----3----2----3----2----0----3---------
          -2----2----2----0----0----3----3----2----3----2----2----1---------
          -4----0----0----0----0----0----0----2----0----0----1----2---------
          
          
          Verse:
          G G7sus-G7 Cmaj7-Am7 Cm/M7-Cm6 G D G
          
          Bridge:
          Cm Cm Cm Cm G E7 A7 D
          
          
          Verse 1:
          I [G]know (I know)
          You be[G7sus]long[G7] to [Cmaj]some[Am7]body [Cm/M7]new[Cm6],
          But to[G]night you be[D]long to [G]me. [riff, see below]
          
          Verse 2:
          Al[G]though (although)
          We're a[G7sus]part[G7], you're [Cmaj]part[Am7] of my [Cm/M7]heart[Cm6],
          But to[G]night you be[D]long to [G]me. [riff, see below]
          
          Bridge:
          Way [Cm]down, by the stream
          How [Cm]sweet it would seem,
          Once [G]more just to dream in the [E7]moonlight, [A7]
          [D]My honey
          
          Verse 3:
          I [G]know (I know)
          With the [G7sus]dawn[G7] that [Cmaj]you[Am7] will be [Cm/M7]gone[Cm6],
          And to[G]night you be[D]long to [G]me.
          
          Just to little old me. 
          
          
          
          Intro:    repeat 2x
          -2-2-2-2--3-2-----
          -3-3-3----3-3-3---
          -2-2-2--------2---
          --------------0---
          
          
          Riff between verse 1 and verse 2:
          -2-2-2-2--3-2-------5-5-5-3--3-2--2--0--
          -3-3-3----3-3-3-----3-3-3-3--3-3--3--3--
          -2-2-2--------2-----4-4-4-4--4-3--3--3--
          --------------0-----0-0-0-0--0-0--0--0--
          
          Riff at end of verse 2:
          ------0---0-2---2-3-2-3---5--5----------
          -3--3---3---3---1-1-1-1---7--7----------
          -2--2---2---5---2-2-2-2---5--5----------
          -0--0---0---0---0-0-0-0---0--0----------
          
          
          Coronet Solo:
          -2-----------0-2-0-------0-2-0-------0-2-0---2-2-2-----2-0-5--2----------
          -3--3----1-3-------3-0-3-------3---3-------3-3-3-3---3-----2----3--------
          ----2--2-2-----------0-----------3-----------2-2-2-2-------2-------------
          -----------------------------------------------------------2-------------
          
          Ending:
          ---0-2-5-3---0-2--------
          -3---------3-------3s5s3
          -----------------2------
          ------------------------