The cat's out of the bag: Taylor Swift's big secret is a worldwide live stream from New York City!

The event, which the singer was teasing with social media clues last week, will take place Monday, Aug. 18 at 5PM ET via Yahoo Screen.

At first, fans believed the clues -- starting with a video of Swift pressing the number 18 in an elevator -- were leading to new music. However, a page on Yahoo's website went live last Thursday afternoon (Aug. 7), and although it was quickly removed, fans found the posting, and both Just Jared, Jr. and Swift's third clue seemed to confirm the live stream.

"It's definitely an event you won't want to miss," a posting on Swift's website says. So just what will the live stream be about? The best guess, of course, still involves new music. If Swift announces a new album, it will be her first since she released 'Red' in October 2012.