Katie Kerr and Chris Sabino's invitation went viral on Wednesday after it was posted on Reddit and the Huffington Post.
"My phone really started blowing up after it got put on MSN," Kerr said. "It was even ahead of the royal baby."
The invitation forgoes standard RSVP questions for a cheekier checklist. The top reason to go? "Two words: Free. Booze."
"We wanted to have fun with it," Kerr said. "I guess our 15 minutes of fame is turning into more like 24 hours."