One would think Paris Hilton's parents have billions at their disposal ... but for some mysterious reason,Rick and Kathy Hilton just took a $10 million equity line out of their Bel Air mansion.
It's unclear why the Hiltons have any need for such a substantial credit line -- but as one rich person tells us, "It doesn't mean they're broke ... this thing happens all the time."
Attempts to reach the Hilton family for comment were unsuccessful.
