- He's sworn in alongside his Cabinet of 16 ministers
- He holds his first Cabinet meeting with his new government
- The former mayor of Florence and Democratic Party leader is a youthful 39 years old
- He replaces Enrico Letta, who held the top job for less than a year
was sworn in Saturday as Italy's youngest Prime Minister, alongside his new Cabinet of 16 ministers.
It's a step many hope will bring much-needed political stability to the country.
The former Florence mayor, who won control of the Democratic Party in a primary a couple of months ago, ousted fellow party member Enrico Letta in a party vote last week.
Renzi, 39, is nicknamed il Rottomatore -- or "the demolition man" -- for his pugnacious style of politics.
After the swearing-in ceremony at the presidential palace, he headed to the Italian Prime Minister's office, the Palazzo Chigi, to hold his first cabinet meeting.
The lineup for Renzi's new government was published on his website Friday.
Italy's new Finance Minister is Pier Carlo Padoan, currently deputy secretary-general and chief economist of the Organisation for Economic Co-operation and Development (OECD.)
Serving Interior Minister Angelino Alfano, of the Nouvo Centro Destra party, keeps his job in the new government.
Half of Renzi's ministers are women, the largest proportion in Italian history. Most of the ministers are young by Italian standards, with an average age of 48.
Renzi is expected to outline his new policies Monday in the Senate, where he will face a confidence vote.
History of political turmoil
Letta held on to the top job in Italian politics for less than a year.
He was sworn in last April at the head of a coalition government formed after months of uncertainty following inconclusive elections. But he was forced out last week amid frustration over the slow pace of reform.
Italy, the third largest economy in the eurozone, has had more than its share of political turmoil over recent years.
The last election to produce a leader was in 2008, when Silvio Berlusconi became Prime Minister for a third time. Since then, all the country's leaders have been appointed.
Berlusconi, a billionaire tycoon who has dominated Italian politics for two decades, resigned in late 2011 after coming under pressure for Italy's economic woes. He was subsequently expelled from parliament after his conviction for tax fraud and can no longer run for office.