TMZ has learned Britney's new lawyer, Adam Streisand, is related to Babs herself, and he's not afraid to name drop!
Adam is Barbra's second cousin, though he's said publicly said they don't speak and that she's a very private person.
But we're told in private, Adam's quite willing to talk about the lineage.
Adam has been brought in by Trope and Trope to challenge Brit's conservatorship -- in particular, the appointment of Brit's dad, Jamie.
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