Ballas canceled Monday's rehearsal because of a party for his mother, TMZ reported, but Palin, daughter of former Alaska Gov. Sarah Palin, canceled Tuesday because she had to give a speech and canceled Wednesday because her son Tripp was sick.
TMZ said Palin was able to practice only a half-day Thursday.
Ballas and Palin are scheduled to dance together when the show premieres live a week from Monday.
Other sources counter that Ballas is happy with Palin's progress, and will practice all weekend and each day next week, TMZ said.
Ballas is a professional ballroom dancer and a singer-songwriter-musician.