Afraid to upstage the bride. What to wear to a wedding, or maybe not

Q. I am going to a wedding reception in the Outer Banks this weekend. I have this spectacular dress and I am not sure if it is really okay for the occasion. The wedding is of an old family friend and she has always been pretty wild. All I know about the event is that it is at 7PM and the plates were $35 per person.

Okay, to the dress.

It is all over silver beads and sequins on grey chiffon with spaghetti straps and a plunging neckline. It fits like a dream but there is quite a bit of skin. Ahh... I like it sooo much and have never had the opportunity to wear it, but I am scared of upstaging the bride. BTW, I am 33 and she is 55 and, again, has always been a very outgoing party girl.

What do you think? The sequins and beads are in alternating vertical lines down the length of the dress. It hits below the knee with a zig zag hem line. It's kinda like a sexy Suzie Snowflake frock. Please help. Thanks. (Wilmington, NC)