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Published 12:06 5 Mar 2016 GMT
Updated 13:08 5 Mar 2016 GMT

Just look at the joy on little Gavin's face.
Sadly he lost his battle against Embroyonal Rhabdomyosarcoma, a cancer of the muscles attached to the bones, in 2014, but there is no doubt that the day spent with McGregor was one of the happiest in his short life.

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