It is the club's first piece of silverware since winning the La Liga title back in 2019.
So, naturally, the team enjoyed the occasion - with Messi at the heart of the celebration.
Pretty much every player took a picture with Messi and the trophy during the post-match scenes.
The likes of Frenkie de Jong, Ansu Fati and Miralem Pjanic, among others, poised for pictures with the legendary forward.
Messi's teammates hilariously lining up to take a picture with him got fans talking online.
I know it's mostly the young kids but absolutely hilarious how everyone wants a photo with Messi and the trophy. https://t.co/TrmnwdtSiM- Roy Nemer (@RoyNemer) April 17, 2021
One joked: "Pjanic just sneaking in between some youngsters for a photo with the GOAT."
A second commented: "By the look of it he's also having fun doing that for them. Good vibes."
A third wrote: "Everyone wants photo with Messi and then photo with trophy."
The cup final triumph also marked Ronald Koeman's first trophy since taking charge of Barca.
Speaking after the game, he said: "We are very happy and we deserved to win at least one title this season and we will fight for La Liga until the last game
"The club deserves it. It is a happy day for all Catalans.
"It is a deserved success. We have made changes to the team this year, but the players have delivered."
The Catalan giants could still bag another trophy this season as they remain in the hunt for the league title.
They currently occupy third-place, two points behind league leaders Atletico Madrid with eight games remaining.
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