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The couple walked hand-in-hand as they wheeled out their luggage at the bustling transport hub.
Ned was equally dressed down in jeans and open-neck shirt combo.
Both wore sunglasses to shade their eyes from the Californian sunshine as they laughed and joked together after their Virgin flight.
The Titanic actress is said to have been still seeing on-off model boyfriend Louis Dowler when she visited Branson's Necker island back in September.
She ended up hitting it off with Ned, 33, who was also holidaying there, that he accompanied her back home to New York, where she now lives.
Kate split with film director husband Sam Mendes in March last year, and she says they have an amicable relationship.
