Nicky Hilton and Hollywood Producer Boyfriend Split

Nicky Hilton and David Katzenberg (X17 Online)

LOS ANGELES – Heiress Nicky Hilton quietly split with her longtime boyfriend, David Katzenberg, after four years, the New York Post reported Friday.

Hilton and Katzenberg -- the son of DreamWorks executive Jeffrey Katzenberg -- went their separate ways despite hopes from her family that the two would eventually tie the knot. Sources said the split was amicable and happened after their work pushed them in different directions.

"Nicky has been back and forth traveling overseas a lot with her business," a source said. "She has recently been in Asia promoting her jewelry line, and David is starting a new production company."

The source added, "Their schedules never seemed to match. There is no scandal or any third person -- they remain close friends. They have been friends since they were teenagers."

Representatives for Hilton and David Katzenberg declined to comment.