The trio, who have a total of 48 Grammy Awards between them, laughed and smiled during the NBA matchup.
Beyoncé, 34, paired a simple white shirt with a black leather jacket, oversized hat and leggings. The "Formation" singer accessorized with a pink pair of heels and mirrored shades.
Jay Z, 46, kept it casual in a gray t-shirt and black denim, while Lamar relaxed in gray sweats and a sweatshirt.
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Matthew Morrison's Dream Duet Partner? Beyoncé!
Also in attendance was DJ Khaled, who greeted Beyoncé and Jay Z with a handshake, before joking around with Lamar in a Snapchat video. "I'm up to something," he teased.
Just last week tickets went on sale for Beyoncé's "Formation" World Tour, which kicks off this April.
Reporting by PATRICK GOMEZ