How do I get my boyfriend's friends to stop complimenting me?

I've been dating my boyfriend for about 5 months now. In the beginning of the relationship, his friends were friendly but nothing out of the ordinary.

Recently though, a few of them have started talking to me on their own- texting, etc. I didn't think anything of it since I would consider them my friends.

Now two of my boyfriends best friends won't stop commenting on how "beautiful" they think I am, and what they would do if I wasn't dating my boyfriend. I told them to stop but it hasn't. I don't know if I should mention it to my boyfriend? He gets pretty jealous about those things...

Advice?
How do I get my boyfriend's friends to stop complimenting me?
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