Drop a few jokes
Sit with them and tell them everything is going to be OK.
Why let her get him? I laid eyes on him first, he's mine!
Let the guy choose who he likes, you don't want to loose your BFF over a boy.
Don't follow along, you would never want your friend to do that behind your back...plus you have a super hottie waiting for you.
If she was a real friend, she wouldn't mind if I stole her boyfriend...right?
Be smart, you don't want to show off to much, just a simple "hey" to start off.
You want them to get the impression of "cool" so you show off...just a little. No big deal.