Some stage names are iconic: Madonna, Rihanna, Cher, Beyoncé. Technically, the Queen of Pop's first name really is Madonna, while others adjusted their given names to reflect their on-stage alter egos ...

Grammys queen Lady Gaga just graced the stage to deliver a performance of her hit song "Abracadabra". And—as is always the case with Gaga—she brought something new once again. This time, it involved ...

Gaga attended Monday's Devil Wears Prada 2 premiere in support of her cameo in the film, for which she also recorded a few ...

From enemies to frenemies to friends, here's everything we know about the pop icons' gossip-fueled rivalry.