Lindsay Lohan (who turned down a role in The Hangover) denies she stole the recipe for her tanning line, as alleged in a lawsuit filed against her.

"No formula was stolen for Sevin Nyne!" the actress – who just turned 23-years-old – Tweeted. "It's a woman looking for a payday. That's it!"

Scientist Jennifer Sunday filed a federal lawsuit against Lohan and her business partner, Lorit Simon, for breach of contract, theft of trade secrets, civil conspiracy, intentional interference with contractual relations and deceptive and unfair trade practices.

Lohan takes credit for co-creating the spray tan mist – named after her lucky numbers, and sold for $35 at Sephora – with Simon, a Las Vegas-based businesswoman.

The lawsuit alleges Simon and Sunday were negotiating over samples of the product, but couldn't agree on a price.

"The next thing we know, Lorit Simon and Lindsay Lohan are partnering, and Ms. Lohan is taking credit for developing this formula, which she indeed had no role in," Sunday's lawyer, Marcia Cohen, told the St. Petersburg Times yesterday.

The new issue of Us Weekly reports Lohan turned down the role of stripper Jade in The Hangover after declaring the script had "no potential."

Heather Graham ended up playing the part in the flick, which made $206 million and topped the box office for several weeks.