The victim was found at an address in Nightingale Road, Edmonton, just after 1pm today.
A 25-year-old man was arrested on suspicion of murder and is in custody.
A Met Police spokesperson said: “Police were called to an address in Nightingale Road at 13.07pm today to reports of a stabbing incident.
“On arrival officers discovered a female collapsed in a garden area.
“A man has been detained and remains in custody.”
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