The 40-year-old model attended the game with Brooklyn by his side, telling ET's Kevin Frazier, "He's a good boy" when asked what it's like to see his kids turn into stars in their own right.
"That's all we want for our children -- to be passionate, for them to be good and polite kids," Beckham continued.
Passionate, indeed! Beckham's eldest son -- a seasoned model and aspiring fashion photographer -- was excited to meet the "great" Kanye West at the historic game, later taking to Instagram to share a snap of the two posing at center court.
But Brooklyn isn't the only Beckham kid with massive talents -- Cruz likes to sing, Harper is already following in her mom's fashion design footsteps and Romeo crushes it on the dance floor!
"[Retiring is] a hard decision obviously," Beckham explained. "But when you know, you know. It doesn't mean [Kobe's] not going to miss it."
"I knew and I still miss the game," he added. "But it's a night to celebrate. What he's done for this town and what he's done for the game."
Like Beckham, the Los Angeles Lakers star also retired after a 20-year career and has an "amazing" family of his own. Bryant has been married to his wife, Vanessa, since 2001. They share two children together -- 13-year-old Natalia and 9-year-old Gianna -- who both sat courtside at their dad's final game.
"He's got an amazing family, amazing children, so to spend more time with them, I'm sure that's what he's going to be looking forward to," Beckham said. "I'm sure he'll have plenty else going on."
Prior to the game, Beckham shared a pic of he and Bryant to his Instagram, which was accompanied with a sweet message praising the NBA legend.
"Tonight will be full of emotions, happy ones & and sad ones but we celebrate the career of one the games greatest players and a true LAKER," he captioned it. "It's been an honor watching this man win championships and to have done it in style just the way this city expects... Easier said than done... Congrats my friend on a career that many people dream of."
Bryant scored a remarkable 60 points in his last NBA game -- the most points ever made by a player in their swan song -- leading the Lakers to a 101-96 victory over the Utah Jazz.
In addition to Beckham and West, a number of other A-Listers were spotted in the crowd, including longtime Lakers fan Jack Nicholson, Jay Z, School Boy Q, Adam Levine, Snoop Dogg and Kendrick Lamar. Bryant's former teammate, Lamar Odom, was also in attendance, and spoke to ET about his marriage to Khloe Kardashian, rumors that he has started drinking again and the legacy his "older brother" has left on the NBA.