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It's been a rough week for Gary Busey.

The 66-year-old actor -- who was eliminated on Sunday's Celebrity Apprentice -- is currently at the hospital with his 1-year-old son Luke, TMZ confirms.

Busey's rep declined to go into specifics, saying only that Luke is being treated for a "childhood illness." The tot is expected to return home with Gary and his fiancee, Steffanie Sampson, by the end of the week.

"Gary is very grateful to his fans for their love and support," his rep adds. "Steffanie and Gary thank everyone for their get well prayers for Luke."