February 20, 2007 04:05 PM

During Britney Spears’s recent wild weekend, her ex, Kevin Federline, canceled plans to party in Las Vegas during the NBA All-Star weekend in order to stay in Los Angeles to be available for the couple’s children, sources tell PEOPLE.

“Kevin is concerned for Britney and his children,” says a friend of Federline’s. “Of course he’s concerned about her. He loves her. He’s always loved her – even after she started divorce proceedings.”

The pair, who split in November, have two sons together, Sean Preston, 1, and Jayden James 5 months.

According to another source, Federline had booked a room from Feb. 14 – 19 at the Venetian Resort Hotel Casino, but canceled the reservation.

It’s not clear if Federline has been in direct contact with his two sons or Spears, who voluntarily entered a rehabilitation facility on Tuesday.

A rep for Federline could not be reached for comment.

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