KELLY ROWLAND and MATTHEW KNOWLES

The singer has parted company with Mathew Knowles following a heated row, according to website Bossip.com.

A highly-placed source in Rowland's camp tells the website the split has been on the cards for months - because the My Boo hitmaker is unhappy she's not a bigger star in America.

A spokeswoman for Bossip.com says, "We were told Kelly was really upset that she's not better represented in the United States. She's a big hit in Europe, but not in America."

Publicists for Knowles and his MusicWorld organisation were unavailable for comment as WENN went to press.

Source: WENN