The billionaire media tycoon, 86, was accused of paying young showgirls and others to give false testimony about the allegedly raunchy parties.

The other 28 defendants were also acquitted - among them Moroccan dancer Karima El Mahroug, known as Ruby, who figured in an earlier Berlusconi case.

Berlusconi has faced many court cases.

In the Ruby case, the right-wing senator won an appeal against his conviction for paying for sex with an underage prostitute. Ruby and he both denied having had sex and she denied having ever been a prostitute.

In his various court cases, he has denied wrongdoing, accusing prosecutors of pursuing a political vendetta against him. He insisted the parties - described by some as "orgies" - were actually elegant dinners.

The only Berlusconi trial that ended in a conviction was his sentencing for tax fraud in 2013. Given his age, Italian justice treated him leniently - he did a year of community service at a care home near Milan.

Berlusconi was prime minister three times between 1994 and 2011. He was accused of giving witnesses millions of euros in hush money in the "bunga-bunga" trial, but said the money was given as compensation for reputational damage to people linked to the notorious parties.

He was temporarily barred from political office over his conviction for tax fraud, but won a seat in the Senate in 2022 elections.

His Forza Italia party plays a key role in Italy's ruling right-wing coalition, led by Prime Minister Giorgia Meloni. She hailed his acquittal as "excellent news that puts an end to a long legal case that also had important repercussions on Italian political and institutional life".

As Italian leader, Berlusconi forged a close friendship with Russian President Vladimir Putin. And this week, Berlusconi made controversial comments about the war in Ukraine which were condemned by Kyiv.

On Sunday, Berlusconi said he would "never" have met Ukraine's President Volodymyr Zelensky, as Ms Meloni did last Thursday in Brussels on the sidelines of an EU summit.

Berlusconi said that if President Zelensky had stopped attacking the two Russian-backed regions of Donbas in eastern Ukraine, the war would not have happened. "So I judge very, very negatively the behaviour of this gentleman," he said.

Ms Meloni reaffirmed Italian support for Mr Zelensky after Berlusconi's remarks. And Zelensky aide Mykhailo Podolyak denounced Berlusconi as "a VIP agitator who is acting in the interests of Russian propaganda". "He is bartering away Italy's reputation for his friendship with Putin," he said.