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Kim Kardashian

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Who needs beauty sleep when you're Kim Kardashian?

The star of E!'s Keeping Up With the Kardashians dared to bare by posting two naked selfies and one video of herself getting bronzed in her Miami hotel room late Thursday night. Kim left little to the imagination, although she did cover her nipples with her hands and used a makeup bag to hide her genitals. "Nothing like a midnight spray tan, you guys," Kim teased. "Tanorexic."

Kim is in the Magic City to support Kanye West, who's bringing his Saint Pablo tour to the American Airlines Arena this weekend. Prior to sharing an intimate look at her new tan with fans, Kim spent the day trolling her assistant Stephanie Sheppard, who was celebrating her birthday. Kim first shared an Instagram picture of herself in Mexico that showed Stephanie's reflection in a glass door. "Happy Birthday@steph_shep I love this pic of us!" she teased. The next photo, taken during the same vacation, showed Kim striking a sexy pose while Stephanie noshed on some food nearby. "Seriously @steph_shep thanks for always having my back and eating all my left overs so they don't go to waste!" Kim wrote in her caption. A third photo showed Stephanie sipping a glass of rosé while Kim spoke to an employee at their villa. "You're so professional @steph_shep," Kim said. "So responsible & thanks for never drinking on the job!"

Kim Kardashian

Instagram

Kim's fourth and final Instagram photo—which featured her famous derrière in all its glory—was a tad sweeter. "In all seriousness I'm going to be totally selfless for this one last post," she told Stephanie, seen drinking wine. "Thanks for being my main bitch! Happy Birthday!"

After teasing Stephanie on social media, Kim made it up to her during a birthday dinner with Jonathan Cheban, Simon Huck and Kourtney Kardashian. It was there that Kim gifted her assistant with Karma El-Khalil's "Love Choker," set in 18-karat white gold. Customized diamond letters spell out Stephanie's nickname, each of which retail for $2,000—meaning Kim dropped $18,000. Stephanie was elated, writing on Instagram, "thank you Kimberly." Kim owns the same necklace, which bears her son Saint West's name—and a $10,000 price tag.

Watch the Keeping Up With the Kardashians 10 Year Anniversary Special Sunday, Sept. 24 at 9 p.m., then don't miss the season 14 premiere on Sunday, Oct. 1 at 9 p.m., only on E!