bridal party problems

Ok girls I really need some help with this one!

FH and I got engaged this past Feb and we're getting married in March of 08. We already asked the people who obviously knew they were going to be in the bridal party which is his two brothers and my sister. We were going to wait until this fall though to ask the rest of the people we wanted to be in it.

Here's the problem. FH and I carpool with one of my best friends who we already decided were going to ask to be in the bridal party, but haven't asked her yet. Today on the way home from work we were talking about wedding stuff and I was naming people that were going to be in the BP and without realizing what I was saying I said 'oh and you and Jenna (my other best friend)' and then after realizing what I had just said I followed it up with 'probably'

I feel sooooo terrible! That is not the way I wanted to ask her at all. I wanted to ask her and the other girl Jenna at the same time as they are my two best friends, I was just waiting till FH and I got the real wedding planning stuff underway!

Now however I have to speed things up a little and ask them both cause I don't want them feeling like asking them was an after thought!

So I'm asking you my fellow brides to help me come up with a special way to ask the two of them to be my BM's. They really are like my other sisters and I want to make them both feel special. (Something which I ENTIRELY suceeded in doing wrong today.)

So please if any of you know of a really nice way to ask them let me know. Cause right now I feel like the worst bride ever!

My BP girls consist of

MOH-sister
BM-Cousin
BM-Cousin
BM- friend since Kindergarten
BM- Friend since 1st grade

all of the above know they are in it.. its obvious

But i am also having

a friend from childhood that through the years we've lost touch.. but when we do talk its like nothing has changed and we always said we'd be in eachothers wedding

and a friend i met in college, who became like a sister, and introduced me to FH

The way in which i am asking them is... i made them cards to give them at the engagement party.. . on the inside is a poem about how them being a part of my day is important to me... and on the cover i am putting a picture from when we were younger for the top 6.. and for my college friend.. one of the first we ever took together.. I also plan on buying them those bridesmaid books... I would try to come up with a way that is personal... maybe take them out to dinner and give them a present... maybe a picture frame with a pic of the 2 of you and mention how important your friendship is