Which One?!?!?!

Okay...I like these two girls. They are both extremely nice, good looking and I have alot in common with each. One problem....They are best friends. That kinda puts a cramp in asking 1 of them out. If I ask one of them out and it dont work out then she will prolly tell the other and then I wont have a chance with EITHER of them. I dunno what to do....Any Ideas of how to choose? This has been on my head for a while. Need some of it lifted....:bash::bnghd: