Can anyone translate this for me please

[julladilok]

This is the birthday card that i got from my friend
Thanks

 

[Half-n-Half]

Something like, "You're an adult now!"

 

[julladilok]

Thank you so much

 

[yuk1]

yes, おとなになっちゃった means kinda " you've became an adult, (but you didn't want to be)."

なっちゃった means something happened by mistake or it happened but you didn't want.

 

[undrentide]

~ chatta means completion with some feelings.
As it is written in a birthday card to you, it could mean "you've become an adult/you've grown up" with mild regret/resignation. Not seriously but rather jokingly.

 

[Mike Cash]

なっちゃった means something happened by mistake or it happened but you didn't want.

Since when?

 

[yuk1]

Since when?

Ex. お腹がいっぱいだったけど、美味しそうなケーキを見たら、食べたくなっちゃった。

----> Since 美味しそうなケーキを見た