I'd be surprised if Arnold Schwarzenegger pardoned Paris Hilton. This article explains why a pardon isn't likely:
"'I don't think the Founding Fathers had Paris Hilton's driving conviction in mind when they enacted the cruel and unusual punishment provision of the Constitution,' said Loyola Law School professor Laurie Levenson.
"She said Hilton had nothing to lose by seeking the appeal and the pardon request, which were probably designed more to garner public sympathy than achieve a legal victory.
* * *
"The governor's office said it would consider the request but suggested that Hilton should not count on a last-minute reprieve.
"'Typically, he only acts in very extraordinary circumstances,' spokesman Aaron McLear said ...."
(Los Angeles Times: Hilton launches appeal, turns to Schwarzenegger for pardon)