It's not only T.O.P's birthday but also the birthday of TEEN TOP's C.A.P!  

SEE ALSO: YG Entertainment celebrates T.O.P's birthday

His group members congratulated him with a delicious looking cake.  After they sang "Happy Birthday," C.A.P blew out the candles and was told to make a wish, which caused them to start singing Girls' Generation's "Tell Me Your Wish" and C.A.P to do the famous leg dance in the cramped car space.  

Each member left a sweet and short message for C.A.P, who has turned 21!  Happy birthday!

Tip: iloveniel