The Skyscraper hitmaker will guest star alongside Valderrama, Danny Trejo, Esai Morales, Jeff Fahey and Briana Evigan in the series, which is based on the 1996 movie starring George Clooney.
It is unclear what Lovato's role in the series will be, but she has shared some behind-the-scenes photos with Valderrama on Instagram.
In one snap with the actor, she writes, "After a long night's work fromdusktilldawn (sic)."
Another picture with series creator Robert Rodriguez reads, "Me and the boss @rodriguez.... We worked fromdusktilldawn.... Get it?? Y'all ain't ready.... (sic)".