Kanye West is keeping up with Kim Kardashian. The rapper was spotted outside a studio in Los Angeles on Tuesday (Dec. 28), reportedly where Kim was shooting a music video for her forthcoming single. According to TMZ, the “Keeping Up with the Kardashians” star worked with Kanye on the closed set for the Hype Williams-directed clip.

“OMG u guys have no idea what I’m doing today! You are gonna DIE!!!!” tweeted Kim, later writing, “What should my alter ego name be?”

The socialite has been in and out of the studio recording her debut album with another hitmaker, The-Dream. No release date or record label has been announced for the project.

Meanwhile, Kanye was photographed with Kim’s mother Kris Jenner at the Lakers vs. Heat game on Christmas Day. He gave her a first listen to his joint album with Jay-Z, Watch the Throne. “Listening to NEW JayZ and Kanye West album with @kanyewest!!” she tweeted. “Doesn’t get any sweeeeeeeter!! He is AMAZING wait till you guys here! Out soon!”