The Keeping Up With The Kardashians star decided against an A-list celebration at a fancy club in favour of a quiet night in with Rob.
Khloe told fans: "I brought in New Year with my best friend in the entire world, Rob. We just finished watching Gone Girl at home. The perfect way to start off the year with my perfect boy. Gone Girl was one CRAZY ass movie! Definitely a must see! Stay safe out there!"
Khloe included a sweet throwback photo of herself and Rob as children in the post.
The 30-year-old is known to be very protective over her younger brother Rob, 27, who has lived at her home for many years.
Rob lived with Khloe during her marriage to ex-husband Lamar Odom and is still resident under her roof, despite recent rumours to the contrary.
An angry Khloe recently slammed reports she had kicked Rob out of her house, declaring: "One of the best things about my house is that my brother lives with me. I would never kick him out."
Khloe and Rob weren't the only Kardashians swapping a big party for a quiet night in.
Older sister Kim, 34, enjoyed an evening at home of cooking and movies with husband Kanye West and their daughter, one.
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