Lindsay Lohan swears she's a different person.

The actress looked lovely in a vintage dress, a Maison Martin Margiela belt and Isabel Marant heels when she appeared on The Tonight Show Thursday, promising her bad behavior is a thing of the past.

Lohan credited her turnaround to working with Oprah Winfrey on her upcoming docu-series, Lindsay, which debuts March 9 on OWN. "I have seen nothing," the 27-year-old actress told host Jimmy Fallon. "It is really interesting as I kept hearing my name [on trailers] and I get really uncomfortable with it."

"It is a television show so they want ratings—they picked the first two months after I got back to New York after I had been in treatment," she explained. "I became really spiritual over this past year and I have been trying to find peace and serenity in my life. So of course they take the chaos of me moving after eight years of living in L.A. back to the city of New York. So it's like 'Oprah reprimands Lindsay!'"

Lindsay Lohan, Jimmy Fallon, Tonight Show

Theo Wargo/NBC/Getty Images for 'The Tonight Show Starring Jimmy Fallon'

As far as her proclivity for making trouble goes, the I Know Who Killed Me star insisted, "That is the past. I feel really lucky to be able to work with someone like Oprah and create. I have a really strong bond with her where I can call her for advice and she has become someone I can learn from in life."

Though she'll soon film a guest spot on CBS' 2 Broke Girls, Lohan said she'd be up for a sequel to her most beloved movie, 2004's Mean Girls. "I saw Tina [Fey] and she mentioned doing a reunion," the actress revealed. "She said she was talking to Lorne [Michaels] about it. She's talking to the big boss."

Lindsay Lohan, Jimmy Fallon, Tonight Show

Theo Wargo/NBC/Getty Images for 'The Tonight Show Starring Jimmy Fallon'

Later in the show, Lohan and Fallon participated in a "Water War." The rules are exactly the same as the card game with one notable exception: if a person loses a hand, his or her opponent gets to throw a glass of water in the other person's face. The first person to empty all five glasses wins the game.

As an added incentive, the winner gets to use a "water cannon" on the loser. "My heart's beating so fast," Lohan said, before asking Fallon to take a before-and-after selfie with her. The movie star lost the first round before crushing Fallon in the next four (she used two cups at once during one round).

At one point, after Fallon's wet white shirt exposed his nipples, the embarrassed comedian used two cards to cover his chest. "Jimmy, you're so sexy that way," Lohan said, laughing at her competitor.

"Why is this happening?" Fallon shouted when Lohan laid down another winning hand.

"Because I have OWN on my side," she fired back.

"Ugh! Oprah! Damn you, Oprah!" Fallon shouted, raising his fists to the sky in mock anger.

Did Lohan show Fallon mercy when she was given the "water cannon?" Watch and find out!

(E! and The Tonight Show Starring Jimmy Fallon are both part of the NBCUniversal family.)

PHOTOS: Lindsay Lohan's red carpet style

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