Bayern beat Bayern Leverkusen 4-2 to clinch the Cup final over the weekend.
This follows the side historic eight successive titles in Germany after a fabulous run in the Bundesliga.
And Boateng, who is on loan at Turkish side Besiktas, has taken to social media to congratulate his younger brother for the amazing feat.
"Since 3 years the cup stays in the hands of the BOATENG family ???????????????? congrats my brother @jeromeboateng ?? "he wrote on Instagram.
Jerome, 31, played an influential role for the Bavarian as they coasted to yet another milestone in the club's enviable history.
Read Full StorySince 3 years the cup stays in the hands of BOATENG family ???????????????? congrats my brother @JeromeBoateng pic.twitter.com/MmrOzcEo8C
— Kevin-Prince Boateng (@KPBofficial) July 4, 2020
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