After famously leaking husband Kanye West's phone call [1] with Taylor Swift [2] over the weekend, Kim Kardashian [3] was spotted at Milk Studios in LA with sister Khloé on Tuesday afternoon. The mother of two — who was there to film a segment for Keeping Up With the Kardashians [4] — appeared serious in all black, while Khloé flashed a sweet smile as she made her way into the studio. Since Kim shared the incriminating footage of Taylor on Snapchat, several stars — including Selena Gomez [5], Katy Perry [6], and Chloë Grace Moretz — have taken to social media to voice their opinions on the matter [7]. In fact, Chloë, who's already had a tumultuous history with the Kardashian family [8], called Kim and Taylor's feud "petulant and unimportant," to which Khloé quickly responded with a post [9] that included a graphic photo of a girl in a bikini, which she presumably thought was Chloë. Keep reading to see more of the ladies' outing, then get all the details on Kanye and Taylor's feud [10].