Lady Gaga has joined Apple Music! Mother Monster took to her Twitter account on Tuesday to announce that she is a part of the new streaming music service and congratulate Tim Cook and Jimmy Iovine on the positive first reactions to the project. "So happy for Tim, Jimmy and everyone at Apple Music and Beats1," she tweeted. "I'm excited to be a part of it."

Apple Music is a new music streaming service unveiled by Jimmy Iovine at the WWDC event in San Francisco on Monday. The new app combines a music service with a worldwide live radio station, as well as a social network called Connect, which will give artists a page where they can share lyrics, backstage photos, videos and more directly with fans.

Apple Music launches on June 30th and after a free three month trial period, it will cost $9.99 a month for a single user. The app will be compatible with iOS for iPhone, iPad and iPod touch and as an update to iTunes. 

Monsters, what do you think of Apple's new streaming service? Let us know in the comments below!