According to posts from the Kardashians on social media, the reality star enjoyed a belated beachside celebration in Malibu, California. Kim Kardashian, Kanye West and their 2-year-old daughter, North, were all in attendance, as were Kris Jenner and her boyfriend, Corey Gamble.
"My Heart... This is everything....#love #family #happybirthdayrob," Kris captioned an Instagram photo originally posted by her two eldest daughters.
Proving there's no bad blood, amicable exes Scott Disick and Kourtney Kardashian were there as well, and they brought along their oldest children, Mason, 6, and Penelope, 3. Kylie and Kendall Jenner were also all smiles at the family outing.
Kourtney sweetly captioned an Instagram caption of her siblings, Kanye and Scott, "Fams."
One person notably missing from the fun? Khloe Kardashian. But her absence was not on purpose! Apparently, she was feeling a bit under the weather.
"The kiddies got me sick," she tweeted. "Feeling like s**t today. Take your vitamins world."
The kiddies got me sick 🤒😷😔 feeling like shit today. Take your vitamins world— Khloé (@khloekardashian) March 20, 2016
Prior to their beachside photo shoot, the family -- decked out in St. Paddy's gear -- were joined by Kylie's boyfriend, Tyga, and dined at Nobu, a popular Japanese restaurant in Malibu.
So why did the family go green? Well, Rob's actual birthday was on Thursday, March 17 -- aka St. Patrick's Day.
Judging from Kim, Kourtney and Kylie's snapchats, Rob and crew seemingly had a good time, smiling and laughing in the photos and videos documented from the night.
As ET previously reported, Rob kicked off his celebrations early, attending Legoland with his girlfriend, Blac Chyna, and her 3-year-old son, King Cairo, in Los Angeles on Wednesday.
To hear more about Rob's pre-birthday bash, watch the video below.