I spy with my little eye...

Something from Katy Perry this way comes on May 15! Over the weekend, eagle-eyed fans spotted a mysterious billboard in Times Square, New York City, featuring the date along with an image of the pop star's eye adorned in neon new wave makeup.

After fans posted photos of the billboard on Twitter, Perry confirmed that it was hers by retweeting one of the posts (below) as well as changing her icon on Twitter to the same eye image, prompting many to speculate that an album or new single announcement could be coming Monday.

However, when another fan asked the singer, "Album or single?" Perry responded with, "Guess again!"

So, what could it be? A video? A collaboration? The album artwork or track list? Guess we'll have to wait one more day to find out...

Katy Perry's Colorful Album Art: