They picked a great game to attend -- the Lakers were getting destroyed for the first 3 quarters before LeBron activated "playoff mode" and went nuclear on everyone ... exploding for 29 points, 11 rebounds and 6 assists.
The Lakers ended up winning the game 111 to 106 -- boosting the Lakers' record back to .500.
Meanwhile, the Rockets' James Harden extended his 30-point game streak to 32 games, the 2nd longest 30-point streak in NBA history.
By the way, Lakers officials gifted Rihanna her very own customized "Bad Girl RiRi" Lakers jersey, but she didn't wear it ... instead, opting to rock her #23 LeBron James threads.
One last thing ... every year LeBron has won an NBA title, Rihanna has dropped a new album -- and there are rumors she's working on a new album right now.