I (F26) HATE my boyfriend's (F26) female friend. How do I make this bitch go away?

UPDATE: I just got off the phone with my boyfriend so that we could talk about his birthday plans and now I'm even more upset. The good news is that he's agreed to spend his birthday with me but the bad news is that he also mentioned that his female friend got him something for his birthday and won't tell him what it is. Apparently, she hinted that it's something coming up, like an event. I'm afraid she got him tickets to the Rascal Flatts concert, which is coming up soon. I'm freaking outtttttt.

Please help me out. My boyfriend (M26) and I (F26) have been together for six months. He has this one female friend (F26) that is extremely pretty. She's known him almost as long as I have and they consider each other good friends. This girl regularly texts him, calls him, and hangs out with him alone. I can't really say anything to him about her because I also have guy friends that I hang out with. The problem is, I feel like she has feelings for him.

The way she looks at him from across the room, the way she hugs him when she sees him, the way she laughs and acts all cute when he's around, the way she grabs his hand when she's trying to get his attention. When there's a room full of people, 100% of her attention is on him. She'll completely ignore everyone else and she'll follow him around like a little lost puppy.

This girl is nice to my face but whenever my boyfriend and I have an argument, she comes to his rescue and always makes him feel better. For example, about a month ago, we got into a really stupid argument and she immediately comes to his rescue. She texted him, "How about we go out for ice cream that way you can escape the drama for a little while. =)"

His birthday is next week and she's already asking him if she can take him out for his birthday (Just the two of them). He just texted me and asked me if it was okay and I haven't responded yet.

I also feel like she fishes for compliments. For example, whenever they hang out together alone, she always wears something that shows a bunch of cleavage and she'll ask my boyfriend how she looks.

She broke up with her boyfriend a few weeks ago and ever since then, I feel like she's had my boyfriend in her sights. I don't know how to talk to my boyfriend about this because I also have guy friends. However, they just see me as one of the guys so they don't flirt with me at all. Anyone have any ideas? This girl's driving me insane.

tl;dr: My boyfriend (M26) has this female friend (F26) that I feel is trying to take him from me (F26). How do I deal with her?