Washington, Nov 19 (ANI): Pop diva Britney Spears called her marriage to Kevin Federline a mistake, insisting that she tied the knot for all the wrong reasons.

The 'Toxic' singer spoke out about her marriage with K-Fed in a candid new documentary.

I think I married for the wrong reasons, Contactmusic quoted her, as saying.

Instead of following my heart and doing what made me really happy, I just did it for the sake of the idea of everything, she added.

Spears confessed that she didn't know what she was letting herself in for when she walked down the aisle with her former beau. (ANI)