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Madonna admits that she invited Lady Gaga to perform with her but Mother Monster rejected the offer. Madge did her part to put an end to the bad blood between the two pop stars but it might be too little too late. Of course, it all began when Madonna accused Gaga of plagiarizing parts of the song "Express Yourself" and using them in "Born This Way." Well, looks like Gaga isn't willing to let this fight go and continues to denies Madonna's accusations, and said the insults are "making a mockery" of her work. We'll just keep hoping the two work it out - seeing these two pop stars collaborate would definitely be better than watching them feud.