What is the Christian way to ask another "pastor's wife" to stop flirting with your husband?

My husband and I are in this small group with another pastor and pastor's wife and she just recently began flirting with my husband. It is really embarring because not only is her husband there, but there are also other people from our church there as well. She has thrown little chocolate candies at him (ironically they were chocolate kisses), she has given him a wet willie (where she stuck wet fingers in his ears), and just overall gives him more attention than necessary. It is weird because she completely ignores me, but she wants to talk to my husband. My friend and I think it may be because she's the youngest child; and she's just trying to get as much attention as she possibly can. It is bothersome to me because we are held to higher standards than other Christians. How do I approach her in a Christ-like manner that would not be accusatory, but also would cause her to stop flirting with my husband?