Danica McKellar — Fishnets and Stilettos

Kevin Arnold would LOSE HIS MIND RIGHT NOW.

Former “Wonder Years” star Danica McKellar flaunted her figure in a punk-rock-meets-Hollywood-streetwalker outfit yesterday … and damn, she looks GOOOD.

McKellar — who”s 38 years old BTW — rocked the look for a new Avril Lavigne music video.

Avril was there too, but who cares.