John Travolta, who is mourning the death of his 16-year-old son Jett, has canceled his appearance at Sunday's Golden Globe Awards, his rep tells

The actor -- whose latest movie, Bolt, is nominated for Best Animated Feature and Best Original Song for his duet with costar Miley Cyrus ("I Thought I Lost You") -- was scheduled to present. On Thursday, Travolta and wife Kelly Preston held a memorial service for Jett in their Ocala, Fla., hometown. Lisa Marie Presley, Garth Brooks and Trisha Yearwood were among the celeb guests.

Jett died of a seizure disorder Jan. 2 while vacationing with his family in Grand Bahamas. "John just adored him," his pal Tom Cruise recently said.

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