Yes, she has done it. Jessica sailed her yacht, Ella's Pink Lady, across the finish line at the entrance of Sydney Harbour after completing 210 days at sea.
The plucky teenager was one month ahead of schedule and three days shy of her 17th birthday. There will be a real blast at her birthday party.
According to AFP, thousands of people were at the harbourfront - waving banners and many wearing pink - to greet their Aussie girl adventurer.
Jessica's welcoming home party was witnessed by Prime Minister Kevin Rudd and Australian Jesse Martin, the current world record holder, AFP reported.
A hundred-strong flotilla of boats flocked to see her sail into the harbour in her pink yacht.
Incidentally, Martin set the 327-day record in 1999 when he was aged 18.
Jessica's 23,000 nautical mile journey took her through some of the world's most challenging and treacherous waters.
Her 33-ft yacht sometimes had to sail against 40-ft swells and gale-force winds.
Jessica, who reportedly took up sailing at the age of eight, may not see her achievement recognized by the World Speed Sailing Council which stipulates that the minimum age is 18.
However, her seven-month odyssey still makes her the youngest person to ever sail solo non-stop around the world without help.
In her last posting dated May 13 on her official blog, Jessica wrote: "I can't believe how fast this last week has gone. Only two more sleeps till the finish line!
"Have I mentioned how excited I am? It's like the day before Christmas except I don't ever remember getting this excited about Christmas.
"Two more sleeps till a hot shower, fresh food and, and, and, everything else! Mind you I think it's going to take a fair bit longer than that for the whole 'I've just sailed around the world' thing to sink in. It's just too big to get my head around!" - Markk