Lily Allen was left embarrassed after her breast milk leaked in public.

The 'Smile' singer and new mum - who recently gave birth to her and husband Sam Cooper's second daughter, Marnie Rose - suffered the mammary emergency after she forgot to put on her nursing pads as she left the house.

Lily wrote on her Twitter account: ''Left house without me nipple pads and me tits are leaking. #coldandwet #notLOL (sic)''

The 27-year-old pop star is no stranger to tweeting about her breast milk misadventures to her 4 million Twitter followers.

When she was nursing her first daughter Ethel - who is now 15-months-old - Lily boasted she could shoot her milk ''10ft'' from her nipples.

She tweeted: ''My let down reflex ... is pretty good, 10 ft sounds about right.''

At the same time, Lily also ''leaked all over'' herself at a top London restaurant after forgetting her breast pads.

All the experiences have led to the musician thinking about her boobs in a different way.

Speaking about her chest, she mused: ''Boobs are not just sexy fun bags , they be feeding implements too.''