A Question

[Tiger]

I have a question about Leann Rimes:
When she released "I Need You" as a single,how old was she?
I'm asking because I just recentely started seeing the video and she looks like a teenager,which she isn't,is she?
Anyway,she looked like a teenager and acted like one plus it's from the album filled with songs she wrote when she was 16!
Just like "I Need You"!
So in cinclusion,I was wondering if you could answer my question.

Thanks in advance,
Tiger!