Demi Lovato [1] just might be Lyft's biggest fan. After spending plenty of time as a driver [2] herself, the "Tell Me You Love Me" [3] singer decided to meet some of the transportation company's lucky employees, four of whom are also amateur musicians. While the group of drivers got ready for what they assumed was an audition video, they got the surprise of a lifetime from Lovato (and their reactions couldn't be cuter). As if getting to jam with her wasn't cool enough, she also gifted them with tickets to her concert and some coveted professional studio time in honor of Lyft reaching $500 million in tips. Not too shabby, huh? Watch Lovato's heartwarming surprise above!