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Taka posted today , March 21, 2015, on Instagram with the caption: お誕生日おめでとう!タケル!

Rough Translation: Happy birthday! Takeru!

Jamil also posted on the same day with the caption: たける!happy birthday.
めでたしめでたし。

Rough Translation: Takeru! happy birthday.
Hooray, hooray.

In the photo are Satoh Takeru, Taka of ONE OK ROCK, Jamil Kazmi, Shirota Yu, Miura Shohei, and RADWIMPS.

Source: 10969taka | jamilmusicjp