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Mark your calendars for Anne Hathaway's big day!

Wait, don't.

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On Tuesday, the New York Post reported that the actress, 29, and brand-new fiance Adam Shulman have already set the date for October 2012 -- and even sent out "save the date" cards to guests, noting that the "grand" wedding would take place in the NYC area.

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Alas, it's not so. A rep for the "Bride Wars" star told E! News that Hathaway and actor and jewelry designer Shulman, 30, have neither chosen a wedding date nor alerted their guests.

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"I am very much in love with him; Adam totally ruined my plan," Hathaway told Marie Claire U.K. of Shulman, who popped the question in November with a $150,000 sparkler he co-designed with Kwiat Diamond and Fine Jewelry. "I was really actually looking forward to a little alone time [after my split from Raffaello Follieri], and then I fell in love like a fool!"