Manchester City striker Mario Balotelli insists he's always smiling - on the inside.

Balotelli struck a wonderful hat-trick in victory over Aston Villa - but again was muted in his celebrations.

"I am always happy, even when I don't smile," he told

"But I feel a striker has to score. It is my job. That is why I don't smile.

"I am still happy and I can score more."

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