Bella Culley, a pregnant UK teenager jailed in Georgia for smuggling marijuana and hashish from Thailand, has been freed under a plea agreement that sentenced her to the nearly six months she had already spent in jail.

Flanked by her mother and lawyer outside the courthouse moments after being released, Culley, 19, said she had not been expecting to walk free, and was "happy and relieved" at the news.

Culley, from Billingham in northeast England, was sentenced to the five months and 24 days she had already served in jail in the South Caucasus country, where she had been arrested at the airport on arrival in May after going missing in Thailand.

She also paid a fine of 500,000 lari ($A286,000).

Georgian prosecutors say she was carrying 12kg of marijuana and 2kg of hashish in her luggage.

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