WSAW: What Should Amber Wear? Help me pick!

This Saturday I am going to Jen's sister's wedding. I am super excited, as it should be blast. And I can't wait to cheer Jen on when she gives her speech! So now I just need to figure out what to wear.
I tend to "collect" dresses, rather then purchase new ones for events. When I see a dress I love, I buy it (like the story behind GORGEOUS Haute Hippe dress that I wore to the last wedding I attended). So today I went into my dress closet to figure out what I should wear, and I'd love to hear your opinion!

Dress #1 Laila Azhar pleated Strapless Dress

I purchased this dress over a year ago after seeing it on Vanessa Minillo. It has been patiently waiting for an event to be worn to. Normally I would not wear this to a wedding but this is Jen's favorite dress and it's her pick for what I should wear. On Vanessa.

Dress #2:
Robert Rodriguez Yellow Button Front Bubble Dress
I purchased this dress after seeing it on Lauren Conrad. I love this dress and it hasn't gotten much wear in public, or in pictures (Facebook and the blog) I have only worn it with Casey on date nights. I love this dress BUT I lent it to the bride about a year ago to wear to a wedding and I feel like some people might remember it. I love it none the less.

On Lauren:

Dress #3: Lauren Conrad Collection Brittney Dress

I purchased this dress before LC had her Kohls line. I like this dress but it always seems to get passed up by something else and Jen is worried that it's not fancy enough.

Lauren in the same dress but a different color.
Dress #4 Alice & Olivia Striped Print Kimono Tunic
I recently purchased this dress after seeing it on the bachlorette Ali Fedotowsky and then my size popped up randomly on sale at Shopbop.com.

On Ali...I hope her and Roberto get a reality show, I heart her!I would love to see what ya'll think and which dress you think I should rock this weekend!