Spears and Ghalib in December
01/06/2008 AT 06:30 PM EST
has done the impossible since her discharge early Saturday morning from Cedars-Sinai hospital: slipping out of her Beverly Hills home undetected despite the constant vigil of paparazzi and media outside.
The pop star, accompanied by Finalpixx photographer Adnan Ghalib since a few hours after her release, popped into the Daily Grill in Palm Desert around 10 a.m. Sunday.
"She seemed in a really good mood, laughing with the guy she was with," says the restaurant's manager.
Spears shielded herself behind large, dark sunglasses and "had a champagne mimosa to drink," he said.
She stayed at the restaurant about an hour, as Vegas Confidential
's Norm Clarke first reported.
Spears, 26, had been keeping company
with Ghalib, 35, before her recent meltdown. The two checked into two hotels over the past couple of weeks, but he was not on hand Friday during her stay in Cedars-Sinai.