Rob Kardashian celebrated his 26th birthday with a wild bash in Las Vegas ... with one very embarrassing party guest.

His mom!

Rob let loose at 1 OAK nightclub at The Mirage in Sin City on Saturday night, with his 57-year-old mother Kris Jenner by his side.

Just look at that photo above. Who insists on posing like that? With those glasses? Oh, Kris. At least Rob looks like he's still having a good time.

The momager was in town to not only celebrate her son's b-day, but also help launch Rob's Arthur George Street sock line at the Kardashian Khaos location in Vegas. 

Would you want to party in Las Vegas with your mom? Sound off below!

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