Brighton defeated Liverpool at the Amex Stadium, defeating the FA Cup holders when Japanese winger Kaoru Mitoma scored a fantastic late goal.
Harvey Elliott put Liverpool ahead but Brighton equalized in an enthralling first-half break when Tarik Lamptey's attempt was deflected by Lewis Dunk.
Using a smooth touch, he flicked the ball away from a defender before shooting past Alisson into the far corner, causing chaos at the Amex and putting Brighton into the fifth round draw.
Brighton remain Liverpool's bogey team thanks to a last-gasp winner:
Brighton 2-1 Liverpool: In injury time, Kaoru Mitoma scored the game-winning goal in the FA Cup fourth round.
Holders Liverpool were knocked out of the FA Cup in the fourth round on Sunday, losing 2-1 to Brighton & Hove Albion, with Kaoru Mitoma scoring in stoppage time.
Harvey Elliott put Liverpool ahead, but a Lewis dunk equalized before halftime, and the score stayed 1-1 until Mitoma scored with a spectacular finish in the 92nd minute.
Brighton defeated Liverpool for the second time this month, winning 3-0 in a Premier League match.