LeAnn (shown with husband Eddie) not seeking treatment for an eating disorder or substance abuse.

LeAnn Rimes joins the long-list of celebs who have gone to rehab, but the country singer's reason may be a first - she is stressed out from Twitter!

Rimes has reportedly been arguing with fans on Twitter who also happen to be fans of LeAnn's nemesis Brandi Glanville.

In an odd sounding scenario, Rimes somehow tracked down the phone number and called one of the fans she was arguing with online to challenger her on the phone.

As fate would have it, the fan actually recorded the call and released it online.

Despite the fact that LeAnn pursued the fan and placed the call, it is still illegal to record a phone conversation in California unless both parties know (most states only require one party to know the conversation is being recorded) and LeAnn is now suing the woman for taping the conversation and releasing it.

More details here.

Meanwhile…Rimes checked herself into a 30-day in-patient program on Wednesday, the day after she turned 30.

Her representative Marcel Pariseau tells People.com, "LeAnn has voluntarily entered a 30-day in-patient treatment facility to cope with anxiety and stress.

"While there will be speculation regarding her treatment, she is simply there to learn and develop coping mechanisms. While privacy isn't expected, it's certainly appreciated."

The country star will continue to perform in September, with her spokesperson adding, "The facility has granted her permission to keep her weekend tour obligations, as LeAnn doesn't want to disappoint her fans. She will report back after each weekend."

The star's husband Eddie Cibrian has pledged to fully support his wife during her treatment and has praised her courage for seeking help.

He adds, "My wife is the most remarkable and courageous woman I know. I am so proud of her for having the strength to finally take some time for herself. I will be with her every step of the way."

Rimes' representative tells the website the star is not seeking treatment for an eating disorder or substance abuse.

(Image: WENN)