Is Britney Spears Bipolar?

Singer Britney Spears laughs as she looks at her phone while watching the Phoenix Suns play the Los Angeles Lakers in their NBA basketball game, Sunday, April 8, 2007 in Los Angeles. (AP Photo/Mark J. Terrill)
AP Photo/Mark J. Terril
The cause of Britney Spears' bizarre behavior has been subject of much speculation. Some say she's on drugs, others say it's post-partum depression and now a psychologist is saying it could be bipolar disorder.

"Her erratic behavior has moved into bipolar disorder," psychologist Dr. Robert Butterworth, who has not treated the singer, told Us magazine.

Recently, Spears' actions have rivaled even her February head-shaving melt-down. Last month she jumped into the ocean wearing nothing but her underwear, and the next day she raised many eyebrows with her conduct during a photo shoot for OK! magazine. According to the magazine, she ruined thousands of dollars worth of clothes and even made off with some. At one point she was grooving to Janet Jackson's "Rhythm Nation" and the next she was storming off.

"Your energy level and emotions alternate between highs and lows, and that seems to have happened here," Butterworth told Us magazine.

Photos: Britney and K-Fed
But Psychologist Robi Ludwig, who also hasn't treated the 25-year-old, told Us that the singer might have a mood disorder. Ludwig also said that her behavior is "self-destructive, erratic and dramatic," and could indicate drug or alcohol use.

"She strikes me as someone going through a delayed adolescence," Ludwig said.

Indeed, some of the postings on Spears' Web site haven't seemed to be the musings of an adult mother of two.

In large, bold red letters, she writes "You'll Never See It My Way Because You're Not Me."

Then she asks her fans to vote on titles for her new album. Among the choices are: "Omg is Like Lindsay Lohan Like Okay Like" and " What if the Joke is on You."

Then she concludes with another cryptic quote: "Mother to grandmother, and my my, you're grand."