Someone won't just let it go. Madonna is milking the Lady Gaga diss train for all it's worth. Madge brought up the Mother Monster -- again! -- at her MDNA tour stop on Nov. 4 in St. Paul, Minn. But rather than referring to Gaga as "reductive" or an imitator, Madge joked that the singer "rejected" her offer to share the stage. Boo hoo. Madge is all butt hurt about being told no.

The Material Girl said, "I have the best fans in the whole world. So take that, Lady Gaga!"

Oooh! Is that an affront to little monsters? Lookout, Madge. The monster contingent is no joke, and they will use "by any means necessary" tactics to respond to that comment. They don't take kindly to their heroine being dissed, nor do they like to be criticized for their devotion to her. So "Shh" with the comments about the little monsters.

But more importantly, Madonna joked about the offer she extended to Gaga, saying, "You know, I invited her on stage to sing with me. But, she turned me down. It's okay. I've been rejected before, it builds a little character."

Okay, will give it to Madonna there. That was funny! She admitted to inviting Gaga to share the stage and that she got rejected. At this point in her career, we doubt Madge is told no very often. We are almost annoyed with Gaga for not finding a way to make that happen.

We'd die 10 times if it did actually happen down the road. Come on, ladies. Take the hatchet out of one another's backs and bury it for good.

PopCrushers, do you think Madonna is wasting her time continuing to stoke the coals of this feud?