Credit: Kevin Mazur/WireImage

Some good news for Xtina.

A day after her arrest (and embarrassing mugshot) for public drunkeness in West Hollywood, Christina Aguilera has been named a musician coach on NBC's upcoming musical competition The Voice.

"I'm so excited," Aguilera, 30, said in a statement.

It's a much needed boost for the troubled star -- who won't be prosecuted for her March 1 arrest. (Her beau Matthew Rutler was also busted for driving under the influence.)

Tuesday's episode was just the latest in a string of blunders for the "Beautiful" star, whose divorce from Jordan Bratman will be finalized in less than six months.

Aguilera notoriously flubbed the national anthem during Super Bowl XLV Feb. 6, nearly fell off the stage one week later at the Grammys -- and, behind closed doors, has been acting out, according to several pals.

"Her drinking is out of control," one insider told Us Weekly.