Being a new aunt certainly agrees with Haylie Duff.

Hilary Duff's big sister was spotted leaving the Chateau Marmont in West Hollywood, where the former "7th Heaven" actress enjoyed a baby-free evening with friends. Duff was all smiles in a tight salmon-colored minidress as paparazzi snapped away.

The Duff sisters certainly have good genes. Just months after giving birth to baby Luca, Hilary was spotted on vacation in Mexico, looking fit in a black bikini.

Check out Haylie's little pink dress below:
haylie duff tight dress

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