(NY Daily News) - “Keeping up with the Kardashians” star Scott Disick is devastated by the death of his mother, friends said Thursday.

Disick and Kourtney Kardashian, his live-in partner and mother of his two children, flew to New York from Los Angeles to attend his mom’s funeral this week on Long Island.

Bonnie Disick, of Eastport, L.I., died suddenly last week. She was 63. Friends say that Disick is devastated by the sudden death of his mother. “Scott was very close to his mother,” a family source told RadarOnline.

Details of her death and funeral remain private. Scott Disick has not commented on his heartbreak.

Bonnie Disick appeared in a 2011 episode of the Kardashian spinoff reality TV show “Kourtney & Kim Take New York.”

“It was a small affair. There was just a handful of people,” the family source said of the funeral. “No other Kardashians beyond Kourtney attended. But the entire family is saddened with the news of Bonnie’s passing. They loved her so much.”

Scott Disick, 30, was an only child. Bonnie Disick is also survived by her husband, Jeff.