Only On Radar: Doug Axed From Paris, Inc.

Hills star and amateur baseballer Doug Reinhardt has been fired--as Paris Hilton's boyfriend, and as a hand in her media empire.

"Paris is completely over Doug's constant quest for publicity and fame...her friends were very concerned about Reinhardt's motives," a source tells RadarOnline.com of the once hot n' heavy pair.

"Doug has been calling Paris all day today, crying, and Paris has already moved on," the source says.

While a Hilton rep told other outlets that the break was amicable and the pair hope to remain friends, we've learned that a major cause of the rift was his treatment of the heiress' sister Nicky.

"Doug didn't treat Nicky very well, and that was extremely concerning for Paris. Paris gave Doug the benefit of the doubt, but over time she realized what was really motivating him, his own career, or lack thereof," the insider said.

Paris will head straight back to work, filming a franchise of her MTV hit "My New BFF" in Dubai, for which Doug was supposed to serve as producer.

We've confirmed he's been stripped of that title as well.

(Photo: Wenn)