Suni Lee might be an Olympic hero, but she still gets starstruck when meeting her favorite artists ... 'cause the Team USA gymnast fangirled out while watching LISA at the Victoria's Secret Fashion Show -- and then they hung out at the after-party!!
The gold medalist was present at the big event ... and before all the models did their thing on the runway, she revealed she was excited to watch Tyla and the BLACKPINK member perform.