Though analysts voiced some doubts as to whether a political comeback would be easy, dozens of delighted supporters turned out to cheer the 78-year-old former prime minister as he arrived for a celebration at his secondary residence in Rome.
"I will carry this memory for ever in my heart," he was quoted as saying by Italian media.
Then, displaying the gift for a one-liner that helped him win three terms as premier, the former cruise-ship crooner added: "But that's enough emotion for now. Bunga, bunga for everyone!"
"Finally the truth. Today is a beautiful day for politics, justice, the rule of law," Berlusconi said in an earlier statement.
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"I am back in the field, to build... An Italy that is better, freer and fairer."
The ex-premier's lawyer Franco Coppi had told the court that while "not even the defence team is denying acts of prostitution took place" at Berlusconi's raunchy dinner parties and hot-tub sessions, it was all above board.
Some commentators said the billionaire would now be gearing up for general elections expected to be held in 2018, but analysts cast doubt on his chances of resuming a heavyweight role in Italian politics.