Lindsay Lohan really needs to get a job.

With all this free time on her hands, the celebrity clearly can't steer clear of trouble. Case in point #145? The one-time actress stands accused of swiping the formula of 11 herbs and spices used for her Sevin Nyne spray tan line.

Jennifer Sunday is suing the "workaholic" and entrepreneur Lorit Simon in federal court for breach of contract, theft of trade secrets, civil conspiracy, intentional interference with contractual relations and deceptive and unfair trade practices.

She wants some serious payback.

Sunday says she had a deal with Simon's company for a tan line but balked at Simon and Lindsay's request to buy the formula. Sunday says she was shocked to discover her "sunless secret" ingredients used in the $35 Lohan-branded Sevin Nyne.

"It was initially envisioned [Sunday] would manufacture the product and ship out the spray to Ms. Simon's company," plaintiff attorney Marcia Cohen tells E!.

"Now we see Ms. Lohan taking credit for having created Ms. Sunday's formula."

No comment from the skank or her reps. Click to enlarge some recent Lindsay Lohan pics showing the struggling star leaving Samantha Ronson's house ...

[Photos: Fame Pictures]