Kendrick Lamar and Lady Gaga have taken their friendship to the next level. Although rumors of them collaborating with Eminem were quickly nixed, the pop star has revealed that she is indeed working with Lamar. She just tweeted out that she will appear on a track on the Compton, Calif. native's new album, good kidm.A.A.d city, which drops October 2. You can check out her tweet below.