Chelsea and Arsenal will meet in the Women's FA Cup final after respective 3-0 wins over Manchester City and Brighton.
The Blues took the lead against the defending champions in the 23rd minute at the Academy Stadium when Erin Cuthbert controlled a corner with one touch and then fired the ball past Karima Benameur Taieb.
The goal prompted questions over whether the goalkeeper might have done better, and that was the case again five minutes later when Melanie Leupolz beat Taieb with a low shot from the edge of the box.
Chelsea penalty appeals were unsuccessful when Jess Carter went down under the attentions of Lauren Hemp, and Taeib then made good saves to deny Sam Kerr and, after the break, Cuthbert.
Caroline Weir and Vicky Losada sent efforts off target at the other end before an 89th-minute header from Beth England, brought on just before the hour mark, sealed Chelsea's place in the delayed 2020-21 competition's final at Wembley on 5 December.
Jess Park subsequently saw a stoppage-time effort superbly tipped against the post by Ann-Katrin Berger as Gareth Taylor's City, who have taken just four points from their opening five games of their 2021-22 Women's Super League campaign, endured another disappointing outing.
In the other semi Arsenal nearly broke the deadlock in the first-half at Meadow Park but Nikita Parris saw her header cleared off the line by Brighton's Victoria Williams.
It only took two minutes into the second-half for the hosts to take the lead when Mead weaved her way into the box and pulled it back for Little, who smashed the ball home.
Mead got on the scoresheet herself in the 53rd minute after collecting a neat ball from Jordan Nobbs, before the forward drilled her shot into the bottom corner.
Williamson rounded off the scoring in the 76th minute when she powered home a header from a corner.
Republic of Ireland skipper Katie McCabe played the entire game for the Gunners and she will be hoping to start a first final, having appeared as a substitute in the 2018 final defeat.
