You obviously want to be noticed and you want to use your GF for that. Sick, yes. Can that work, it can!
When out in the club, treat your GF as a princess, kiss her, keep touching her hair, make her laugh, lift her up in the air
, don`t be shy, take the space, if you dance, use all the floor. She will respond the same, looking at you with passion, touching you, kissing, showing her obssesion with you. Other females will notice this with their hitech radar 
, they will memorise this, they will want to be that girl who is with you. But next time, when you approach some of them, or when they approach you, be totally different: be cool, calm, not needy, be fun but don`t try to hard to impress her (remember, you already did that when you werer showing of with GF), let her try to impress you, show her that you are not a hunter, you are a target. If she shit tests you (f.e. will you buy me a drink), neg her back. Afterall, you are the catch, the target.Enjoy!