Manchester United beat Brighton 7-6 on penalties at Wembley to set up an FA Cup final with Manchester City.
Solly March fired his spot-kick over the crossbar before Victor Lindelof converted to win it for United.
It finished 0-0 after extra time and Brighton had chances to win it but goalkeeper David de Gea denied Alexis Mac Allister, Julio Enciso and March.
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Marcus Rashford nearly won it for United late on but Seagulls goalkeeper Robert Sanchez made a superb save.
Manchester City beat Sheffield United 3-0 in the other semi-final on Saturday.
The final will take place at Wembley on Saturday, 3 June.