Mary-Kate Olsen's new TV role as a devout Christian seems to have gone to her head.

The 21-year-old actress - who has been cast in hit TV show "Weeds" as Tara, a God-fearing marijuana-smoker living in a Christian community - was overheard spreading the word of God on a night out with twin sister Ashley at New York's Beatrice Inn nightspot last week.

A source told the New York Daily News newspaper, "Mary-Kate grabbed a male admirer and cried, 'Christ saves all! I save all!'

"Then she ruffled his hair, gave him a kiss on the cheek and told him, 'Consider yourself saved!'. He looked totally stunned and stumbled off."

Mary-Kate Olsen recently revealed she loves to run around her house in the nude.

She said: "I run around my house naked with heels all the time. It's so funny. All my friends will tell you I love running around in kimonos and jewelery or naked with jewelery."

She also confessed she sometimes pretends to be identical twin Ashley when she is out on her own.

Mary-Kate said, "Sometimes, if I'm out I'll say I'm Ashley or if I'm making reservations for a restaurant I'll use my sister's name - actually most of the time."

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