BTS [1] kicked off the 2021 Jingle Ball at The Forum in Los Angeles on Friday night with performances of their megahit "Butter," as well as a holiday remix of "Dynamite," but it's safe to say that all eyes were on Jin! Midway through the performance, fellow bandmembers Jungkook, RM, J-Hope, V, Jimin, and Suga surprised Jin with a four-tier cake for his 29th birthday. Moments later, the ARMY serenaded him with "Happy Birthday." Watch Jin's sweet birthday surprise and keep reading to see BTS's best looks from iHeartRadio 102.7 KIIS FM's Jingle Ball red carpet!

Jin Celebrates His 29th Birthday at the 2021 Jingle Ball

BTS at the 2021 Jingle Ball Red Carpet

Jin at the 2021 Jingle Ball Red Carpet

J-Hope at the 2021 Jingle Ball Red Carpet

Suga on the 2021 Jingle Ball Red Carpet