Kendall Jenner Cheers On BF Devin Booker At Knicks Vs. Suns Game

The Kendall Jenner-Devin Booker relationship is still clearly going strong ... the "KUWTK" star hit up MSG to watch her man vs. the Knicks on Monday -- and the dude BALLED OUT for her!!

Kendall and some friends got box seats for the Suns game in New York ... and D Book certainly put on a show for them.

The 24-year-old NBA star scored 33 points in 41 minutes ... and led Phoenix to a 118-110 come-from-behind victory.

And, Kendall was clearly impressed ... cameras caught her smiling and giggling throughout the evening!!

The two began to get cozy about a year ago, when they were spotted on a road trip to Sedona ... and they've seemed to grow into quite the couple over the past 12 months.

They've been seen out on dates plenty of times ... with Kendall even posting a sappy pic of the duo for Valentine's Day last February.

As for any sort of "Kardashian Curse," there clearly ain't one here ... Devin is having a hell of a season with Kendall by his side, averaging 25.5 points, 4.1 rebounds and 4.5 assists per game!!