The 26-year-old has signed a five-year contract with the Russian giants.
The Russian side confirmed their swoop for the forward on their official website on Monday evening.
Hulk has long been linked with a move to Chelsea.
Reports claim Zenit have paid around £40million for the former Tokyo Verdy superstar.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?