An eyewitness tells E! News that Lamar enjoyed a guys' night out with his father and some male friends, all of whom watched the concert from a private VIP suite at Staples Center.
We're told that Khloé, who surprisingly did not tweet or post any Instagram evidence of her night out, sat in a different part of the arena and did not run into her husband of four years.
Meanwhile, a source says that Lamar, who spent a week last month training at the University of Rhode Island in Kingston for a possible comeback with the L.A. Clippers, has been really working on his relationship with his dad, Joe, and they've been spending a lot of time together, including Thanksgiving.
The source says that Lamar is doing really well, working hard to strengthen his relationship with his dad and his two kids—and working out, physically, three times a day.
He is in phenomenal shape, the insider adds.
Things do seem to be slowly shaping up overall for the 34-year-old athlete. Lamar cut a deal in his August DUI case Monday, pleading no contest to driving under the influence in exchange for 36 months of probation. He must also complete an alcohol-education program by June 9 and pay $1,814 in fines.
The latest on him and Khloé is that his wife is "in no rush to make any decision," a source told us just yesterday.
Lamar told fans who were pressing him with questions outside the gym in Rhode Island last month, "Khloé and I are fine."
"Thank you @Gunnar for kicking my ass today," Khloé tweeted today to celeb trainer Gunnar Peterson.