I heard that Catherine Zeta-Jones and Nicholas Cage had studied BJJ for a while.

I'm surprised the article didn't mention that the following celebs had trained for varying amounts of time under Bruce Lee:
Roman Polanski
James Garner
James Coburn
Steve McQueen
Joe Hyams
And on the set of The Wrecking Crew, Bruce had trained Sharon Tate for her fight scene with Nancy Kwan. I assume that BL also prepared Dean Martin for his fights against Ed Parker, Joe Lewis, and Chuck Norris (this was Chuck's first movie appearance). And I think Mike Stone was in it, too.