Lady Gaga Showin Skin at Tony Bennett"s Bday! (TMZ TV)

Lady Gaga looked like she was hittin’ a club instead of Tony Bennett’s 90th birthday tribute — still, we’re willing to bet there were no complaints.

Gaga showed up to Tony’s birthday celebration Thursday night at Radio City Music Hall with a see-through black dress … hiked right up to her crotch.

She looked awesome, but that’s a dangerous outfit to wear around the elderly.

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Lady Gaga Showin Skin at Tony Bennett"s Bday! (TMZ TV)