Kevin Rudd has ousted Prime Minister Julia Gillard as leader of Australia's Labor Party.
He won 57 votes in a leadership ballot called by Gillard, who received 45 votes.
The change comes ahead of an election called for 14TH September, which polls suggest Labor is set to lose.
Rudd is more popular with voters than Gillard, and many believe Labor will perform better in the election under him.
The vote took place three years after Gillard ousted Rudd as prime minister in 2010.