Demi Lovato's presence was felt even in her absence ... thanks to the Cheat Codes.
The EDM trio -- best known for their hit song "No Promises" featuring Demi -- replaced Demi when she was forced to cancel her headlining appearance Thursday in Atlantic City. The Cheat Codes stepped in and, of course, gave Demi a huge shout-out and dedicated "No Promises" to her.
As we reported .... Demi canceled her gigs in Atlantic City and Toronto. FOX also yanked her "Beat Shazam" guest appearance that was scheduled to air the night she was hospitalized.
Tons of celebs -- including Macklemore -- have showered the singer with strong words of encouragement following an overdose earlier this week at her Hollywood HIlls home that left her in dire straits.