Reporter: This morning, lady gaga is making no apologies in her new song, "do what you want" released skoefr night. ♪ You don't own my life ♪ Reporter: And on twitter. She's... See More
Reporter: This morning, lady gaga is making no apologies in her new song, "do what you want" released skoefr night. ♪ You don't own my life ♪ Reporter: And on twitter. She's launched a full-on assault against her critics. In tweet after tweet, she highlights the head lines that have haunted her throughout her career. Like this one, lady gaga is fat now. With a photo of her heaviy ier self performing. The singer telling her 40 million followers my recovery is a daily battle. Celebrities need to have a thick skin and number two be able to laugh at themselves. She's incorporated them both in the series of tweets. Reporter: And the megastar is not holding anything back. Look at this tweet. Madonna hates gaga. She's over. With a link to this interview. When you saw born this way, did you think -- when I heard it on the radio. I said, yes, that sounds very familiar. Reporter: Gaga firing back. I don't need anybody's permission to be remembered. I will be. Whether they like it or not. It would be hard to forget some of her latest eye-popping performances. First, at the mtv video music awards. And right here on "gma," where she performed a "wizard of oz" version of her last single, "applause." That song was also mnksed. Applause didn't debut at number one. Katy is better than her. People are always trying to compare gaga to katy perry. She's saying, I'm not getting into this game of who's number one. You can be number one. I'm happy with who I am. Reporter: Her latest song is barely eight hours old. It's already number one on itunes.
This transcript has been automatically generated and may not be 100% accurate.