Khloé's estranged husband Lamar joined the Kardashian family in the VIP section to support Kim's rapper fiancé at his LA show.
"Lamar walked into the arena to huge cheers," an onlooker told PEOPLE. "He came in with Khloé, Kris [Jenner], and the whole crew, Kim included.
"Lamar set next to Khloé in the VIP section. He was smiling and talking to her. They seemed so happy to be out together and both said 'hi' to friends around them."
It wasn't just Khloé who was glad to be with her husband of four years.
"[Lamar] got up at one point and hugged Kris, who embraced him with open arms and a big smile," the source added.
After greeting the rest of the group, Lamar is said to have sat down with reality TV star Khloé. The source said he was "talking and smiling as Khloé played with her hair. Lamar's gaze was fixed on her.
"They were in conversation like two old friends catching up. They seemed to have a lot to say."
It wasn't the first time they had been spotted together since their split in September.
At the beginning of October they were spotted together in a car at around the same time as the news of Khloé's mum's Kris Jenner's split from Bruce Jenner was announced.
Sources have reported that the young couple are trying to save their marriage and Lamar has spoken out about Khloé's famous family saying that they are "the ONLY ones that have been here consistently 4 me during this dark time."
At the end of the summer, basketball star Lamar was detained for "driving under the influence of alcohol and/or drugs", according to reports.
Shortly afterwards, he hit headlines for checking out of rehab after just one day after seeking help for his drug and alcohol abuse.