Khloe Kardashian took to Instagram Monday to congratulate her younger brother, Rob Kardashian, on his 27th birthday.

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"Happy birthday @robkardashian I would be lost without you!! Thank you for being the best brother anyone could ask for," Khloe, 29, captioned a collage of photos of herself and Rob.

"This year I want to give you the ability to see yourself through my eyes! I want you to own how incredible you are and shine the way you are meant to shine. I love you!!!!"

Rob has been battling weight problems for months and the current season of "Keeping Up with the Kardashians" has documented his journey trying to get in shape.

"[He] is really depressed," an insider told Us Weekly of his weight struggles.

"Rob has a trainer he's supposedly working out with. But Rob rarely shows up for their sessions. He's not losing any weight."