The Bajan pop princess was spotted at LAX airport with her sibling on Tuesday (27 August) and was clearly concerned for him to stay close by, as she placed a protective arm around his shoulder while they walked through the crowd of waiting fans and photographers.
RiRi, 25, was wearing more pieces from her upcoming River Island collection, including a camouflage onesie, which she layered up with an oversized black hoodie.
She also sported her favourite 'G4LIFE' beanie hat from the high street range and a pair of sunglasses.
Rajad, 17, looked just as effortlessly cool as his older sister in a leaf print T-shirt, jeans, shades and black biker boots similar to Rihanna's.
He slung a pair of headphones around his neck and even appeared to be carrying his own hand luggage - something that RiRi wasn't doing. Although maybe she had her essentials hidden in that huge hoodie pocket?
Rajad is Rihanna's youngest brother (her older brother is called Rorrey), and she has two half sisters and a half brother on her Dad's side too.
The siblings are noticeably close and RiRi makes sure to still they spend quality time with Rajad amid her hundreds of work commitments and her hectic schedule - even if it means he has to accompany his superstar sister on her trips to various cities and states.
It was recently reported that Rihanna had treated her little brother to an expensive sports car for his '16th birthday'. However, Rajad was quick to dismiss these rumours and even found the idea of him owning a car funny, especially since he doesn't have a driving license yet.
Rajad wrote to one fan on Twitter: "Well I'm 17, my birthday is in April and I don't have my license lol #thesourcelies."
He then joked: "I love my non-existent Mercedes!"
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