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David Del Rio has brought in one of Hollywood's most powerful attorneys -- Shawn Holley -- in the wake of his sudden firing from CBS' "Matlock" after his costar Leah Lewis accused him of sexual assault ... TMZ has learned.

Sources with direct knowledge tell TMZ ... Del Rio retained Holley -- whose client list includes the likes of Kim Kardashian , Justin Bieber , and Lindsay Lohan -- this week as he navigates the fallout from the allegation that got him booted from the hit CBS show last month. Sonja Flemming/CBS

TMZ broke the story ... Leah filed an allegation with CBS against David on Oct. 2 for an alleged sex assault she claims occurred Sept. 26. We were told on the day of the report, he was removed from the lot ... and after an investigation, he was fire

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