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Kim Kardashian's Italian wedding to Kanye West over the weekend was a very exciting and joyous event. But there appears to have been some tension brewing just before the ceremony, as Rob Kardashian flew back to L.A. from Paris instead of attending the wedding. So are we now learning why Rob skipped his sister's wedding?

Hollywood Life reports that Rob was upset because he found out that Kim was saying hurtful things to other people about his weight gain. "Kim was bashing Rob about his weight and how he would ruin the pictures that would be taken with the family," a source says.

After Rob "called her out" about it, things "got heated, and everyone decided to take Kim’s side," the source adds. “Rob was devastated and left.”

Meanwhile, X17 is reporting that Rob thinks Kim is too superficial. "Rob said he was sickened by Kim and Kanye’s display of wealth and clothes and beauty and called it 'superficial bullst’," says an insider. "But Kim was pissed that Rob hadn’t made an effort to drop any weight over the past few months."

We think it's sad that Rob didn't attend the wedding, and we hope that the family is able to patch things up.

Are you surprised by this reported argument? 

Sources: Hollywood Life, X17