Rob allegedly booked a flight from Florence, Italy, where Kim married rapper Kanye West in front of approximately 200 guests.
According to TMZ Rob was in tears while booking his seat back to California.
A video was published of Rob arriving back in the US and apparently was not very talkative as he made his way through LAX airport.
Meanwhile proud mum Kris Jenner gushed, "I'm beyond bursting with happiness for Kim, Kanye and baby North."
"Such a magical, romantic wedding!
"I feel blessed to have my new son and his family as part of ours."
Reportedly Rich Wilkerson Jr., a pastor from North Miami, performed the ceremony.
Kimye’s wedding was organised by long-time Kardashian-Klan family friend and celebrity event planner, Sharon Sacks.
Prior to the wedding Kanye appeared to be very nervous beforehand, swigging obsessively from a bottle of water. Bless him.
An eyewitness told* People*, "It was funny how nervous he was. He clearly knew the gravity of what he was about to do.
"This morning he was all smiles, but as it got closer, you could see that the nerves were kicking in. It's common for most grooms. I've seen it all before."
Who knew Kanye West a big softy, we’re loving you more and more each day Mr West. Congratulations again!