LMesser032511_01_X17newer230WM.jpgTeen Mom's Leah Messer has filed for divorce from Corey Simms ... six months after tying the knot.

Messer filed divorce papers in Kanawha County last week. She tells Us, "Everything Corey and I have done has happened so fast."

The couple have had a rocky relationship from the start. After dating for only one month, Leah became pregnant with twins. Immediately after their twin daughters were born, Messer and Simms split. Six months later the Teen Mom and Simms reunited.

Messer tells Us:

    "Three years ago, back before I was pregnant, I never thought I'd be married now. I was scared because a lot of people who marry young end up divorcing within a year."


Hear what Messer said about her difficult upbringing ... after the jump.