Rob Kardashian is reportedly "crushed" by his mother's gushing over Kanye West.

Rob Kardashian Photographed For The First Time In Months

After allegedly skipping out on Kardashian's birthday, Jenner attended her son-in-law's over-the-top bash at The Staples Center in Los Angeles.

“The fact that Kris was at Kanye’s birthday party says it all,” an insider told Radar Online on Tuesday. “She was also super involved in planning the party with Kim. But for her own son Rob’s birthday, she ditched him to go on vacation with her friends! Rob thinks it is just disgusting and tactless and he was crushed by that.”

According to the source, “Rob sat home by himself alone last night” while the rest of his family, including Kim, Kourtney and Khloe Kardashian, as well as Jenner's boyfriend, Corey Gamble, partied the night away in honor of West.

“Kris thinks that she can go and post support for Rob’s sock line on her Instagram and everything is cool between them,” the source explained, “But it’s not. Their relationship is strictly business and she has been distant from him for years."

In addition to her birthday attendance, Jenner gushed over West on Instagram, telling fans he was like a son to her.

A photo posted by @krisjenner on Jun 8, 2015 at 6:48am PDT

"Happy Birthday to my son @kanyewest #KanyeWest!!!!" Jenner captioned the photo. "You are such an amazing Daddy, husband, friend, son and brother...you are such a special part of my family and we feel so blessed. Thank you for sharing your passion, creativity and love with me each and every day. You are such an inspiration!"

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Rob kardashian, Kris jenner, Kanye West, Keeping Up With The Kardashians, E!, Reality TV