Their stunt corrdinator, Noon Orsatti, is also in the episode; he's the guy at the bar who "Piper" poors the shot down his throat...her future husband David Donoho is next to him. He's the one who gets very - "up close and personal" with her for a few seconds, to put it in a clean manner.
And for all those who think Holly played a great drunk...it's because she really was, during an interview not long before the mid-way point of season eight Rose McGowan was teasing her about it being her favorite episode, which that scene is not, and she admit to being under the influence. Not that you could really blame her mind you, I'd have to be pretty wasted as well to dance in front of everyone like that on such a small piece of furniture. Lol.