By Breaking Celebrity News Staff

Well, that was fast! Only eight days after announcing she had "entered a 30 day in-patient treatment facility to cope with anxiety and stress," LeAnn Rimes was back on stage performing Friday night.

LeAnn appeared at the Regional Arts Center in Eau Claire, Wisconsin. She'll be on stage in Iowa Saturday night and Indiana on Sunday.

'I'm totally cool and so happy. I think I'm about to cry," LeAnn told her audience as she wiped away a tear.

Her 70-minute show went off without a hitch even when she confessed to fans, "I'm pissed off at a lot of things, and I just can't say it. So, it comes out in the music."

It also comes out on Twitter.

As Breaking Celebrity News has been reporting, the country singer became so angry at one of her Twitter followers, she phone her to give her a piece of her mind.  The woman, a school teacher, allegedly recorded the call and now LeAnn is suing her for invasion of privacy.