Check out TaeTiSeo's backstage photos from M!Countdown

Celebrating their 1st win from M!Countdown last week, here are Taeyeon, Tiffany and Seohyun who posed with their trophy and celebratory cake!

Take a look at their lovely and adorable photos from M!Countdown's waiting room below~

♥ Watch TaeTiSeo's 'Holler' performance from M!Countdown here

♥ Buy TaeTiSeo's 'HOLLER' here

♥ More about TaeTiSeo's 'Holler' here