Leni Klum dazzled on prom night in her mom Heidi's black strapless dress from the '90s
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- Heidi Klum's daughter, Leni, wore her strapless dress to prom.
- Leni, 18, shared photos of the occasion on her Instagram account Monday.
- Heidi, 48, first wore the dress for a comedy event in 1998, according…
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