Hugh Hefner was left at the altar because his 25-year-old fiancee Crystal Harris wanted two things -- a bigger allowance and a career in the music biz.
Sources close to Crystal tell us she was fed up with the "couple hundred dollar" weekly allowance she got from Playboy -- and wanted to make her own cheese.
We're told Crystal purely focused on launching her music career -- even with the wedding just days away.
Sources involved in planning the massive wedding say Crystal felt like she "couldn't be married to Hef and have a successful music career" -- even though millions and millions of people are married with careers ... and with MUCH less money.
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