This is the heartwarming moment a gigantic 450lb black bear shows he is just one big silly sud at heart.

The huge bear - named Finn - was treated to an impromptu bubble bath at his enclosure in Zoo Knoxville, in the US state of Tennessee, while keepers were cleaning it.

Finn and his fellow bears had been evacuated from the enclosure while the keepers washed it down with special safety soap.

But when they came back Finn made a beeline for the bubbles that had not washed away from the bears' swimming pool.

And as the 10-year-old bear settled into the foam, it was clear he was having the time of his life.

As he dived under the bobble, he surfaced with them all over his snout and seemed to revel in the applause from children watching him.