Lenny Dykstra — Mug Shot … Old Gray Beard

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Looks like Lenny Dykstra“s going full Gandalf for his jaunt in the pokey — our sources obtained his never-before-seen mug shot … and the former MLB star is sporting the makings of a fierce gray beard.

In case you missed it … Dykstra is currently behind bars for a looong list of crimes … this includes grand theft auto, bankruptcy fraud … and not one, but two lewd Craigslist incidents.

By the make of his mug shot, Dykstra”s clearly prepping himself for the long haul … and what better way to do so than by taking a cue from the cast of “Duck Dynasty.”

Meanwhile, his son Cutter Dykstra continues enjoying all the fruits freedom has to offer … he was recently spotted taking his prego baby mama — “Sopranos” star Jamie-Lynn Sigler — out for a night on the town.