James posted a snap on Instagram of him with his famous father standing courtside at a basketball game.
"Forever smiling with you," the 23-year-old wrote.
It isn't the first time he has paid tribute to his father on social media.
Earlier this month, James posted an old photo showing Bill pushing his then-infant son on a blue train.
"I'll love you forever, Dad," James captioned the touching snap.
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"Could never possibly put into words how I feel about you."
The "Aliens" star, 61, passed away last month after suffering complications following surgery.
He began experiencing health issues related to the operation days later, and passed away at Cedars-Sinai Medical Center on February 25, following a stroke.