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Beth Mead scored one goal and created two others against Brighton to send Arsenal into the delayed 2020-21 Women's FA Cup final against Chelsea.
Mead set Kim Little up for the opener early in the second half before making it 2-0 with a cool finish soon after.
Leah Williamson sealed the victory with a third for the record 14-time cup winners from a Mead corner.
The Gunners will face London rivals Chelsea for the third time in six years at Wembley on 5 December.
Arsenal last won the Women's FA Cup in 2016 by beating Chelsea 1-0, but lost their most recent final against Emma Hayes' side in 2018.
Brighton manager Hope Powell said before the game her side "had more to gain than lose" in their tie against the Women's Super League leaders and the Seagulls would "go out to enjoy" their first Women's FA Cup semi-final for 45 years.
The former England boss would undoubtedly have enjoyed how her unfancied side held the hosts for so long - but that would provide scant consolation.
Even without all-time leading WSL goalscorer Vivianne Miedema, who has been given an extended rest after the international break, the Gunners still had Mead, Nikita Parris and Australian Caitlin Foord up front.
Powell insisted the "pressure would definitely" be on the Gunners to reach a record 17th final, which prompted Arsenal manager Jonas Eidevall to retort that he "doesn't care what other people think" is expected of his team.
At Meadow Park, Arsenal delivered the dominant performance anticipated, even if Brighton did well for long spells to stifle them.
The Gunners had to wait until the 22nd minute to seriously threaten for the first time, at which point Foord had two chances. Denied first by Megan Walsh before sending a header narrowly wide from a Little cross.
Mead was then off target with a rare chance, while England team-mate Parris went close with a header that beat Walsh, but failed to get beyond the backtracking Victoria Williams on the line.
Arsenal played with greater intensity in the second half, with Mead doing well on the left before cutting a pass back in the 50th minute for Little to open the scoring from close range.
Four minutes later Mead doubled the advantage, starting the attack with a fine run from her own half before trading passes with Jordan Nobbs and side-footing home.
While Emma Koivisto went close at the other end, Brighton failed to respond before Williamson completed the ultimately comfortable win in the 76th minute.
Former Gunner Danielle Carter, who scored the Arsenal winner when they last lifted the trophy five years ago, was bright for the visitors, but chances were limited.
Awaiting Arsenal at Wembley is a Chelsea side looking to complete a belated domestic Treble after this competition was postponed by three months because of the pandemic.
Player of the match
MeadBeth Mead
with an average of 9.09
Arsenal Women
Squad number9Player nameMead
Squad number6Player nameWilliamson
Squad number1Player nameZinsberger
Squad number8Player nameNobbs
Squad number10Player nameLittle
Squad number5Player nameBeattie
Squad number23Player nameIwabuchi
Squad number19Player nameFoord
Squad number16Player nameMaritz
Squad number15Player nameMcCabe
Squad number12Player nameMaanum
Squad number13Player nameWälti
Squad number14Player nameParris
Squad number20Player nameBoye Sørensen
Squad number29Player nameGoldie
Squad number4Player namePatten
Brighton & Hove Albion Women
Squad number16Player nameBrazil
Squad number24Player nameSymonds
Squad number1Player nameWalsh
Squad number2Player nameKoivisto
Squad number9Player nameLee Geum-Min
Squad number20Player nameWilliams
Squad number18Player nameCarter
Squad number3Player nameGibbons
Squad number5Player nameKerkdijk
Squad number8Player nameConnolly
Squad number7Player nameWhelan
Squad number15Player nameGreen
Squad number19Player nameSimpkins
Squad number6Player nameLe Tissier
Squad number10Player nameKaagman
Line-ups
Arsenal Women
Formation 4-2-3-1
- 1Zinsberger
- 16MaritzSubstituted forPattenat 82'minutes
- 6WilliamsonSubstituted forGoldieat 90+2'minutes
- 5BeattieSubstituted forBoye Sørensenat 83'minutes
- 15McCabe
- 10Little
- 13WältiSubstituted forMaanumat 65'minutes
- 9Mead
- 8Nobbs
- 19FoordSubstituted forIwabuchiat 65'minutes
- 14Parris
Substitutes
- 4Patten
- 12Maanum
- 18Williams
- 20Boye Sørensen
- 23Iwabuchi
- 28Cull
- 29Goldie
- 33Houssein
- 35Hennessy
Brighton Women
Formation 4-3-3
- 1Walsh
- 6Le Tissier
- 5Kerkdijk
- 20WilliamsSubstituted forBrazilat 63'minutes
- 3GibbonsBooked at 80mins
- 15GreenSubstituted forKoivistoat 51'minutes
- 8ConnollyBooked at 74mins
- 7Whelan
- 18Carter
- 19SimpkinsSubstituted forLeeat 51'minutes
- 10KaagmanSubstituted forSymondsat 79'minutes
Substitutes
- 2Koivisto
- 9Lee
- 11Babajide
- 12Bance
- 16Brazil
- 22Robinson
- 24Symonds
- 25Angel
Referee:Abigail Byrne
Attendance:1,328
Live Text
Match ends, Arsenal Women 3, Brighton and Hove Albion Women 0.
Second Half ends, Arsenal Women 3, Brighton and Hove Albion Women 0.
Simone Boye Sørensen (Arsenal Women) wins a free kick in the attacking half.
Foul by Aileen Whelan (Brighton and Hove Albion Women).
Substitution, Arsenal Women. Teyah Goldie replaces Leah Williamson.
Attempt missed. Kim Little (Arsenal Women) right footed shot from the centre of the box misses to the right.
Attempt blocked. Danielle Carter (Brighton and Hove Albion Women) right footed shot from outside the box is blocked.
Substitution, Arsenal Women. Simone Boye Sørensen replaces Jennifer Beattie.
Substitution, Arsenal Women. Anna Patten replaces Noëlle Maritz.
Felicity Gibbons (Brighton and Hove Albion Women) is shown the yellow card.
Beth Mead (Arsenal Women) wins a free kick in the defensive half.
Foul by Felicity Gibbons (Brighton and Hove Albion Women).
Substitution, Brighton and Hove Albion Women. Maisie Symonds replaces Inessa Kaagman.
Goal! Arsenal Women 3, Brighton and Hove Albion Women 0. Leah Williamson (Arsenal Women) header from very close range to the bottom left corner. Assisted by Beth Mead.
Corner, Arsenal Women. Conceded by Maya Le Tissier.
Foul by Noëlle Maritz (Arsenal Women).
Felicity Gibbons (Brighton and Hove Albion Women) wins a free kick on the right wing.
Megan Connolly (Brighton and Hove Albion Women) is shown the yellow card.
Beth Mead (Arsenal Women) wins a free kick in the defensive half.
Foul by Megan Connolly (Brighton and Hove Albion Women).