Cacee quits!

After more than two years as Jessica Simpson’s personal assistant, CaCee Cobb finally told her best friend that she wanted out. On May 7, Cobb celebrated her last day on the job with friends at Arnie Morton’s Steakhouse in L.A. Fighting tears, Simpson, 25, raised her glass and said to Cobb, “You are my best friend. I will be your best friend forever.” Simpson’s rep confirms the professional parting of ways to Us, “It’s true. They remain close.”

Or do they? Once she gave notice, Cobb, 28, didn’t waste time before catching up with her boss’ ex, Nick Lachey. Last week, Cobb met Lachey at L.A. hot spot Shag and cornered him into a half-hour conversation, according to an eyewitness. “CaCee’s still really close with Nick and adores him,” says a source, who adds that Cobb has felt pressured to pick sides in the couple’s divorce wars.

Can their friendship survive the divorce? Who will take over Cobb’s duties as Jessica’s assistant? For more details, check out the current issue of Us Weekly, on newsstands now.