This song is pretty cool, major chick magnet too.
Anyways, I'm pretty sure this is how Brad plays it, so good luck, it's not that hard.

Capo: 2nd Fret

Intro:
e|------------------------------------|
 |---------3-------3-------3----------|
 |---(0)--0----0--0----0--0---0--0----| 2x
 |------2--------2-------2------2-----|
 |-3----------------------------------|
E|------------------------------------|

Verse 1:
Baby...

Strum these chords, just listen it's an easy pattern...

|-0-0-0-|   |-0-0-| On this part strum the 033200 part then hammer on extra
|-3---3-|x3 |-3-3-| finger for the 033210 part fluidly through your strum,
|-3---3-|   |-3-3-| listen, and you'll know, also try to focus your strum
|-2---2-|   |-2-2-| on the bottom strings.
|-0---0-|   |-0h1-|
|-0---0-|   |-0-0-|

Chorus and Verse 2:
 Speed up the strumming tempo and throw some palm mutes in, go through a progression 
this...
  A     B     C     D
|-0-| |-0-| |-0-| |-0-|
|-3-| |-3-| |-2-| |-2-|
|-3-| |-3-| |-2-| |-2-|
|-2-| |-2-| |-0-| |-0-|
|-0-| |-1-| |-0-| |-1-|
|-0-| |-0-| |-0-| |-0-|

Strum part A, then palm mute, strum again and shift to part B, then palm mute, then 
to part C and do the same thing with D.

Solo:
The Solo is just improvisational strumming with the same chords, so do what you want 
it, or try to listen for the exact strum.


End on C |-0-|
         |-3-|
         |-3-|
         |-2-|
         |-0-|
         |-x-|