While most younger brothers might kick up a fuss about going shopping for hair, Rob didn't seem to mind hanging out with Khloe as she browsed for the right locks in a local store, while being filmed for their family's reality TV show.
The 26-year-old Kardashian brother sported a black T-shirt, jeans and trainers for his outing and he also had his tattoos proudly on display.
Rob has been struggling with his weight for some time now and admitted earlier this year that he was trying to lose 40 pounds - something that he aims to achieve through diet and strict exercise regimes.
The reality TV star has even been taking part in a '60 days of fitness' workout challenge with superstar rapper, The Game, in a bid to shift the extra weight.
Meanwhile, 28-year-old Khloe has been working on her body shape too and has donned a variety of figure hugging outfits lately to flaunt her impressive results.
And yesterday (24 June) was no different, as she looked stylish in a short green jacket, tight fitting dark jeans and a pair of peep toe shoe boots.
Her brunette hair was coiffed to perfection too, with a small roll pinned on one side of her parting to keep her layers out of her eyes.
Although their older sister Kim is currently resting in a secret location with her new baby daughter North West, it seems that it's back to work as usual for the other Kardashian siblings, who have picked up filming where they left off and returned to their business duties.
Last week younger sister and model Kendall Jenner was seen posing up a storm with rubber ducks and lollipops on the red carpet in New York, while eldest sister Kourtney ran errands with her son Mason in Los Angeles.
They're definitely one busy family!
What do you think of Khloe's outfit? Let us know below!