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Captain Lanning makes 55 for Australia
Tammy Beaumont 32 for England
England men face New Zealand at 14:30
It really is all going wrong for England. Katharine Brunt sends in a throw, Natalie Sciver - who has just come on to bowl - isn't looking and it hits her right in the temple. Luckily it wasn't thrown too hard, so I think she'll be OK, but we pause for a bit of treatment.
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
"It is coming on nicely. These two have started very aggressive, and they are more aggressive than England players generally."
You can watch those boundaries from the first over now - just scroll down to the '1 over' entry for in-play highlights. England turn to spin, bringing on the off-breaks of Laura Marsh, but she can't stem the flow of runs, as Villani comes down the wicket at her and punches past mid-on for four.
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
"It is rare to see Anya Shrubsole getting hit around. When you haven’t been stretched in the tournament, getting attacked can change your temperament."
It's been all Healy so far but now Villani is in on the act. First she threads a cut shot through the off side to pick up her first boundary, then she drills Shrubsole through the covers when she slightly overpitches. And she makes it three boundaries off the over with a swipe over the infield on the leg side. Big problems for England here.
Jonathan Agnew
BBC Test Match Special
"Katherine Brunt hasn't quite got it right this morning so far."
#bbccricket
John Michael Poole: Can't see anything other than double disappointment for us today. Really hope I'm wrong.
James Bean: Today is a day of destiny go well England!
Healy - a keeper-batter in the typical diminutive-but-feisty mould - advances down the track and lofts Brunt over the top for four. A horrible misfield from Tammy Beaumont allows Australia to scamper through for two, before Healy, who has started like a bullet train, hammers a pull for four. Excellent start for Australia.
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
"I think it looks a good wicket, rock hard and not much in for the bowlers."
Jonathan Agnew
BBC Test Match Special
"Shrubsole thinks she been burgled there. I think that is missing leg."
Image source, AFPAnya Shrubsole - the top-ranked T20 bowler in the world - from the other end, and immediately she raps Villani in front and unleashes a huge LBW shout. Umpire Ravi not interested, might just have been doing too much. Plenty of swing there. Elyse Villani gets off the mark with a two past point, but then misses out on a wide one. That LBW shout was clipping, by the way...
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
"Solid start for Australia, I think they will be pleased with that."
Delicious from Healy, served up on her legs and she clips it away imperiously. The pitch is tinged with green, like a patio that you haven't quite managed to pressure-wash all the moss off, but there's not too much movement for Brunt - and when she strays wide, Healy cuts powerfully to the boundary for another four.
So, Elyse Villani and Alyssa Healy out in the middle. Katherine Brunt with the ball. Here we go...
Plenty of tension and suncream on faces. Both teams giving it some welly, but Advance Australia Fair seemed to get a much more bombastic brass accompaniment. I'd put in a letter of complaint...
#bbccricket
Reverend John: Come on you England women England wipe the Aussies off the pitch. I'm going to enjoy this one.
Philip Mulligan: Massive day for English cricket.
England skipper Charlotte Edwards is the joint top run-scorer in the 2016 Women's World T20 with 171. Here is the top five run-scorers in the tournament for both England and Australia...
Image source, .Jonathan Agnew
BBC Test Match Special
"If that was 5 November you'd want your money back. That was really disappointing as a fireworks display."
Extra pyrotechnics for the semi-final. The teams process out with giant sparklers on either side. It's not enough to impress everybody though...
Ebony Rainford-Brent
Ex-England batter on BBC Test Match Special
"I think with the group games it is about getting over the line. Both teams have done that, but I don’t think either team had a great group stage.
"England got through in two games by the skin of their teeth and Australia got beaten by New Zealand and struggled with the top order.
"These teams came into the tournament as the two top favourites but there is a little bit of a vulnerability in both."