Upgrading RAM to 8 GB

I just bought a 13" MacBook Pro (this one: http://store.apple.com/us/configure/MC724LL/A?mco=MjEyOTY3MTE).
I currently have 4 GB of RAM. I'd like to upgrade to 8 GB. Do I only need to buy one 4 GB stick or do I need to buy two? It looks like there are currently 2 x 2 GB sticks installed, which means I'd need to buy two 4 GB sticks--right?
Thanks!

If you look at the bottom right of that same page... it states:
Specifications
+*2.7GHz Dual-core Intel Core i7*+
+*4GB 1333MHz DDR3 SDRAM - 2x2GB*+
+*500GB Serial ATA Drive @ 5400 rpm*+
+*SuperDrive 8x (DVD±R DL/DVD±RW/CD-RW)*+
+*Backlit Keyboard (English) & User's Guide*+
So it has 2 2GB modules. You will need to get two 4GB modules if you want 8GB.

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