The Skyscraper hitmaker sent fans on an Internet scavenger hunt on Wednesday morning, after she mysteriously took to Twitter.com and wrote, "1. Confident".
Minutes later, her actor beau Valderrama posted, "2. Cool For The Summer", the title of Lovato's current single.
Soon, fans caught on to the Twitter game, and throughout the day they noticed a handful of Lovato's famous friends were rolling out the names of her album's songs.
Kardashian West revealed the 13th and final track, Mr. Hughes, Lopez posted a song called Lionheart, Nick Jonas shared Yes, while Iggy Azalea had the honour of tweeting her duet with Lovato called Kingdom Come.
Lovato also enlisted the help of fellow singers Pete Wentz, Christina Perri, Adam Lambert, Bea Miller, Hailee Steinfeld, celebrity blogger Perez Hilton, and TV/radio personality Ryan Seacrest.