Now that it's clear he and Rita Ora are never ever getting back together, Rob Kardashian had the wackiest 26th birthday ever -- and most of it had to do with the fact that his mom Kris Jenner tagged along to Las Vegas to celebrate with him.

Or, knowing Kris Jenner, it was the other way around.

According to spies for OK! Magazine, the mommy-son duo started things off at the Stack Restaurant at the Mirage where they had a lengthy dinner and downed shots of tequila. Like all good moms do with their adult children.

Sadly, neither of them wound up in bed with George Clooney. So that was a tequila fail right there.

"At one point, Kris, who was sitting at her own table in the main dining room, came back to the private dining room where Rob and his friends were seated to do a toast," claimed a witness, who intimated that Jenner was out in the open while Rob was sequestered off -- either in one of those MOMMMM, YOU'RE EMBARRASSING ME sort of things, or because Rob and his fancy socks weren't cool enough to join her.

The group then headed to 1 OAK Nightclub for cake, which one of Rob's friends ended up smearing on him. (Didn't you know? Kardashians imbibe nutrients through their pores, like plants.)

"Rob was singing and dancing along to the music,” reported another club-goer. "Kris posed with Rob for some photos and then she got on the mic to give him another birthday toast."

If this doesn't sound like a good way to usher in another year, remember who we're dealing with here. He could've been stuck spending his birthday deciding which of his sister's lady bits smelled better.

Rob Kardashian
CPA, Pacific Coast News
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Rob Kardashian Kris Jenner
CPA, Pacific Coast News
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Rob Kardashian Kris Jenner
Denise Truscello, WireImage
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Rob Kardashian Kris Jenner
Denise Truscello, WireImage
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