She wrapped up victory when Errani ended a prolonged rally by dumping a backhand into the net, allowing Sharapova to become the 10th woman to complete a career grand slam after she added the Paris title to her triumphs at Wimbledon (2004), U.S. Open (2006) and Australian Open (2008).
The victory capped a remarkable comeback for Sharapova after many thought her career was all but over when she underwent shoulder surgery in 2008.
Having waited four years to climb back into the grand slam winner's circle, it was little wonder the 25-year-old dropped to her knees and covered her face in disbelief in her moment of triumph.
But this was no time for the queen of women's tennis, who will also climb back to the top of the rankings on Monday, to hide her face.
Image: Russia's Maria Sharapova reacts as she defeats Italy's Sara Errani during their women's final match in the French Open tennis tournament at the Roland Garros stadium in Paris, Saturday, June 9, 2012.