Former TV presenter Anna Ryder Richardson has been cleared of two safety breaches following an incident in which a young boy was seriously hurt when a tree branch fell on him and his mother.
Ms Ryder Richardson broke down in tears as the judgement was made at Swansea Crown Court.
Her husband Colin MacDougall pleaded guilty to four charges - two in his own name and two on behalf of the company, Manor House Wildlife Ltd, which the couple own together.
The court heard how he was more responsible for the upkeep of trees at the zoo.
Three-year-old Gruff Davies-Hughes suffered serious head injuries in August 2010 when a heavy branch fell on him in strong winds. He spent three days in intensive care after being airlifted to hospital.
His mother suffered a head injury and fractures to her leg, pelvis, and arm.
The family, from Llanelli, were visiting the zoo's wallaby attraction.
Mother-of-two Ms Ryder Richardson made her name alongside Laurence Llewelyn-Bowen on the BBC's popular makeover show Changing Rooms.
In 2008 she gave up her TV career and bought the dilapidated 52-acre wildlife park with her husband in west Wales.
Sentencing of her husband will take place at a later date.