Beyoncé and Jay Z weren't the only ones noticeably missing from Kim Kardashian and Kanye West's lavish wedding this weekend.

Lamar Odom Reaches Out to Rob Kardashian?

Kardashian's younger brother, Rob, was also MIA. While he has missed several family gatherings lately, including a recent trip to Thailand, it was shocking for him not to be at his sister's much talked about wedding.

Insiders told TMZ that he opted out of the couple's nuptials because he didn't want to have to take pictures. Another insider told X17 that one reason was weight he has gained over the last year.

More KimYe Wedding Photos Here!

"Kim was pissed that Rob hadn't made an effort to drop any weight over the past few months."

Though Kim was upset that her brother hadn't shed a few extra pounds, it seems like he was also upset with her for the way she was going about planning her third wedding.

The same source added, "Rob said he was sickened by Kim and Kanye's display of wealth and clothes and beauty and called it 'superficial bulls--."

The Kardashian and Jenner clans are reportedly "heartbroken" after Rob flew home "in tears" from Paris skipping the rehearsal dinner as well. The insider continued to say that Rob just felt too out of place to be at the event.

"He just doesn't seem to feel comfortable or happy around his family at all. They're all wrapped up in the same pretty world and he just doesn't fit."

Still, it looks like the Wests had a blast without him. New pictures of the couple's wedding day surfaced Tuesday morning that shows the couple giving each other their wedding vows as well as rocking "Just Married" bomber jackets. Check them out here.

Since the wedding, Rob has deleted all of his tweets. But not before he shot back at critics who continue to laugh at his weight issues.

He tweeted May 20, "So i found out i was trending for being fat...thank you all it really made my day. And to the blogs saying i went to fat camp or rehab LOL then why am i still fat u fools?? y'all must have run out of real news."

He added, 'First, i don't believe in rehab or therapy or anything of that sort and second I'm a grown man and will work on myself when i choose.'

Rob added: 'I'm aware that I'm fat that def aint a surprise to me lol and my only therapy will be in the gym anyways.'

His biggest supporter and sister Khloé Kardashian also stepped in to blast Rob's bullies and tweeted, "What shallow souls some of you are. Its sickening to critique anyone off of their appearance. Grow up! You should be ashamed of your self.Your words are cutting deeper then (sic) you know and are possible leaving lifetime scars! Some of you people are disgusting for calling others names and picking on them.'