MRS
  “I’ve worked hard towards this moment, and I think it’s an important message to tell my fans: even if you’re going through a dark time… don’t ever give up. You can always make your way back to the other end of that circle and find your happiness again.”  

Another image of Gaga in MIB 3 - no reports of acting in the movie, just images used.

Image of Lady Gaga in MIB 3.