Crowe has now logged on to Twitter to thank John for showing his love for his movies by making the purchases.
Crowe's Art Of Divorce Auction saw him sell off artwork, 28 watches, and movie memorabilia for just under $4 million.
The famous breastplate worn by Crowe in Gladiator sold for a whopping $125,000.
The actor made a surprise appearance at the auction, appearing on stage after a rendition of Happy Birthday and subsequent three cheers.
Crowe - who has sons has sons Charles, 14, and Tennyson, 11, with singer Danielle - finalised his divorce last year, five years after their split.
The Nice Guys star said: "Getting to this point with the divorce, and no matter how amicable a split is, you've still got to unwind things at a very deep level. I've never been someone who deconstructs things, I've always been someone who builds things, so it was quite a big lesson in life to become someone in life who can deconstruct things.
"I thought to myself, while I'm in the middle of doing that, how else can I do that? How else can I apply that. This is what I came up with.
"Actually it's been a lot of fun, this is almost like doing a full production."