Credit: Rick Diamond/WireImage

Christina Aguilera wasn't afraid to return to the scene of the crime.

The new Us Weekly reports that on March 4, three days after a wine-drenched feast at Osteria Mozza led to her public intoxication bust, the singer, 30, and her beau Matthew Rutler returned to the L.A. eatery.

On their menu that night? Two bottles of wine -- and absolutely no regrets.

"She acted as if the arrest never happened," a Mozza source tells Us. "When their server offered them dessert, they asked for more wine."

When it was time to leave, "She seemed tipsy," the observer notes. (Thankfully, the "You Lost Me" singer and her set assistant beau stayed safe this time, and went home via chauffeured limo.)

Still, an Aguilera insider notes that the star hasn't changed her hard-drinking habits since her brief, "welfare-related" arrest. "She should see the arrest as a wake-up call, but she doesn't. She doesn't think things are that bad."

Adds another source: "She's nearly fall-down wasted nearly every night."

For more on Aguilera's downward spiral -- her vicious confrontation with ex Jordan Bratman, how her son Max, 3, is faring, and how she "treats everyone like s***" -- pick up the new Us Weekly, out now!