sewing question

[xunpassionedx.livejournal.com]

I'm making pillows for my girlfriend for her birthday and I'm putting a star on each one (to resemble my tattoos). I've never sewn anything in my life and I have my mother helping me but she can't figure out how to fold and pin the fabric for the star so that the points come to a point without having any frayed edges showing.

If anyone could offer any help with this I'd be forever thankful.