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.
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