Warrant Singer -- Tax Cheat of the Week?!

The Accused -- Jani Lane ... that singer dude from the '90s hair band Warrant.

The Debt -- $121,024

The Story -- The Detroit News dug up an IRS record stating Lane, the guy who sang "Cherry Pie" back in 1990, failed to pay federal income taxes for seven years ... that's seven years longer than the amount of time this guy was making money as a rock star.

Lane was busted earlier this week for suspicion of DUI in California.