The Keeping Up With The Kardashians stars both wore all-black gym gear for a visit to their offices in Woodland Hills on Monday (8 December).
Kim, 34, is just back home in Los Angeles following a whirlwind few weeks that saw her visiting London, Australia, Dubai, Abu Dhabi and New York, where she was reunited with husband Kanye West.
She jetted into London with sister Khloe at the start of November to help launch HairFinity in the UK, before heading off to New York to meet up with Kanye, taking a quick pitstop back home in LA, then jetting Down Under to start her perfume tour.
That fragrance tour took her across Australia, then off to Dubai and Abu Dhabi, where she met troops stationed abroad.
A planned visit to India - and appearance in the Indian Big Brother house! - was scrapped last minute due to reported visa issues.
Khloe, meanwhile, has been in LA filming scenes for the new series of Keeping Up With The Kardashians and no doubt taking care of pregnant Kourtney Kardashian, who is expecting her third child in the next few weeks.
Yesterday, both sisters looked as if they wanted to keep a low profile as they left their offices. A make-up free Kim was pictured clutching her mobile phone, while sister Khloe was holding a juice bottle.
This week, it was announced that Khloe and Kourtney had joined Kim's insanely popular app Kim Kardashian: Hollywood.
Players of the game will now see avatars of Khloe and Kourtney joining Kim as they seek to build their profile and rise to the top of the A-list. The stars' mum Kris Jenner already has her own avatar.
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