Worried

Lilly begged to sit by Tristan in church today.  

She told him all about her headbands.

Of my 5 girls Lilly has been the only one to show an interest in boys at this age.
The only boy the other girls had eyes for was their Daddy.

Should I be worried?

The other day this was Lilly after I told her we don't kiss boys (except for Dad and Grandpas) when we're 4.
I should be worried.