At times, the life of Britney Spears has not been easy to live.  Now the pop princess is opening up about what she feels has been her biggest mistake.  Hint: It's not messing things up with Justin Timberlake.

Britney has revealed her absolute rock bottom moment to the British paper The Telegraph.  In the new interview, Spears talks the up and downs of her career.  So what's the one decision she wishes she could take back?

Britney confesses that Britney and Kevin: Chaotic, the 2005 five-episode reality show she did with her then-husband, Kevin Federline, remains her biggest mistake.

"I would never do something like that again," she tells the Telegraph. "Actually, that was really bad. That was probably the worst thing I’ve done in my career.” 

The short-lived series did not go over well with fans or critics: Entertainment Weekly described it as "career suicide by videocam."

When asked if her movie debut, Crossroads, was also something she regretted, Britney laughed, "No! I like Crossroads! F**k you!”