The 'bride' was up there for two hours," Warshaw tells PEOPLE Thousands of people online were left in awe and confusion by a giant wedding dress display ... imagining a couple exchanging vows ...

but actually turned out to be a secret wedding on March 15 "Our guests were initially a little too shocked to speak, then when it set in, cheering and shouts of 'OMG' filled the room," the bride tells ...

Fashion designer Justin Alexander Warshaw posted a video of a larger-than-life wedding dress on Instagram on March ... "Now, before you start imagining a couple exchanging vows, let us clarify ...

cheering and shouts of 'OMG' filled the room," the bride tells PEOPLE A couple shocked their friends and family when they revealed that their engagement party was actually their wedding.

Fashion designer Justin Alexander Warshaw posted a video of a larger-than-life wedding dress on Instagram on March 16 ... "Now, before you start imagining a couple exchanging vows, let us clarify: ...