For someone who refused to go naked on the big screen, describing herself as coming from a “conservative family,” hottie mum, Jessica Alba wasn’t careful enough to let her nip slip while taking a walk in New York streets.

Her exposed breast has emerged online when eagle-eyed photographers got a treat while the Into the Blue star was adjusting her coat, when snapped at the park. The photo revealed the star wearing sheer bra under two other inner garments, including a loose, black tank top that gave her nip away.

This is not the first time that Jessica has sufferred wardrobe malfunction involving her twins. Who would forget Jessica’s black dress almost slipping away before throngs of photographers at the US Hot Hollywood Awards in 2006. She also once let cameras take a peek at her twins in a see through nip slip when photographed in dark green dress.

The mother of one had noted in an interview that while she could act and dress sexy, she could never find herself bare flesh on screen.

"I can act sexy and wear sexy clothes, but I can't go naked," she said in an interview, according to E!Online. "I come from a very Catholic family so it wasn't seen as a good thing to flaunt yourself like that."

Cash Warren is one lucky man!

START the SLIDESHOW and check out Jessica Alba’s hottest looks. You may check out Jessica’s recent nip slip in New York streets here.

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