AceShowbiz -

Madonna once again dissed Lady GaGa. During her Saturday, September 15 concert in Atlantic City, the "Like a Virgin" hitmaker took a jab at her younger rival when she was about to perform "Masterpiece", which can be seen around 6:00 mark of a fan-filmed footage posted on YouTube.

Saying that she dedicated the performance to the "Poker Face" songstress, Madge claimed the Mother Monster was a copycat. "I love her. I love her. I do love her. Imitation is the highest form of flattery," she stated, before adding sarcastically, "And one day, very soon, we're gonna be on stage together. Just you wait."

Madge previously criticized GaGa as the latter's hit "Born This Way" was believed to bear similarities to the former's song "Express Yourself". During an interview on "20/20", the Material Girl said that GaGa's song "feels reductive."

The Queen of Pop recently also took a dig at Elton John, who happens to be GaGa's good friend. "I'd like to dedicate this next song to a Mr. Elton John. I know he's a big fan of it. I know he's a big fan of mine. And you know what? I forgive him. Gotta start somewhere," she said before launching into a performance of "Masterpiece" at her concert in Nice, France, last August.