A teenager caught in Miami smuggling almost 13kgs of cocaine in sponge cake mix boxes has been jailed for 364 days.

Ayesha Olivia Niles of Vermont Road, Upper Norwood, was arrested at Miami International Airport on October 21, 2011, after the drugs- estimated to be worth £400,000 were found hidden in her luggage, stuffed inside 24 boxes of JF Mills Rich and Moist luxury cake mix.

The student mother who turned 18-years-old three days after her arrest, pleaded guilty on Monday (March 5) to cocaine trafficking and conspiracy to traffic cocaine.

She was returning to London via Miami from Kingston, Jamaica when she was "selected for secondary screening" and taken to the inspection area.

A search of her suitcase uncovered 29.03lbs of cocaine, concealed within food product boxes.

A Miami-Dade Police Department arrest report written at the time said "she suspected the activity she was involved in was suspicious but did not question it."

Despite prosecutors previously stating Niles would be charged as an adult, she was sentenced as a youth, and a first time offender.

Niles agreed to a "364 days plea deal" which meant she was given the maximum sentence to be served in an American county jail.

Had she been given any greater sentence she would have automatically served her time at a penitentiary state prison which has a much tougher regime.

She will get credit for the time already served and when she completes her sentence at the Dade County Jail, she will be deported back to the UK.

Last year the mother-of-one, who became pregnant at 15, participated in Channel 4's 4thought.tv, where she called for better sex education in schools.

In the film she said: "I probably wouldn't have got pregnant at the age I did if I had a better understanding of sex education.

"I was on the pill but because I didn't have a good understanding of how the pill works, I wasn't taking it right and that's how I ended up pregnant."