Eric Benet, the soul singer whose album “A Day in the Life” went platinum last year, will make his feature film acting debut in the Fox/Sony pic “All That Glitters,” starring Mariah Carey.Benet, appropriately enough, plays a hot young singer in the pic, currently shooting in Toronto. Film, helmed by Vondie Curtis-Hall (“Gridlock’d”), concerns a singer (Carey) who has to battle adversity on the way to success. Written by Kate Lanier, pic is produced by Carey and Laurence Mark (“Jerry Maguire,” “Anywhere But Here”). In the acting realm, Benet previously had a recurring role on the WB sitcom “For Your Love.” His first album, “True to Myself,” was released in 1996. Another release is planned for early next year.