FIRST LET ME CLARIFY THAT I'M NOT A DEMI FAN, PER SAY.
I just know that I really wanted to know how the song was played, so I assume others do too.
It definitely isn't 100%, so pleeeease make corrections if you have any.

-------------------------------------------------------------------------------
UNTIL YOU'RE MINE - Demi Lovato
-------------------------------------------------------------------------------
Tabbed by: chickenscoop!

Tuning: Standard

Intro & Verse:
e|----------------------------------------------------------------------------|
B|-7--7--7--7--11--11--9--9---7---7--7--7--11--11--9-11-9-7-------------------|
G|---8--8--8--8---8---8--8--8---8---8--8--8---8---8---------------------------|
D|--8--8--8--8---8---8--8--8---8---8--8--8---8---8----------------------------|
A|----------------------------------------------------------------------------|
E|----------------------------------------------------------------------------|
(Intro x1, verse x2)

Pre-chorus
e|---------------------------------------------------------------------------|
B|---------------------------------------------------------------------------|
G|-4-----4--6----------------------------------------------------------------|
D|-4--4--4--6----------------------------------------------------------------|
A|-2--4--2--4----------------------------------------------------------------|
E|----2----------------------------------------------------------------------|

Chorus
e|--------------------------------------------------------------------------|
B|--------------------------------------------------------------------------|
G|-8--4--6--3--8--4--6--6--8--4-----6-3---4--6------------------------------|
D|-8--4--6--3--8--4--6--6--8--4--4--6-3---4--6--3--4------------------------|
A|-6--2--4--1--6--2--4--4--6--2--4--4-1---2--4--3--4------------------------|
E|-------------------------------2--------------2--2------------------------|

Don't know the bridge yet.
Tell me it if you've figured it out, I assume it's derived from the above.