"I'm personally pulling for Robin Thicke at the VMAs," the 1980s TV dad told MTV several days before Sunday night's award show. "Because, well, he's been like a son to me."
As it turned out, Robin walked away with the night's most-talked-about performance, in which a scantily clad Miley Cyrus gyrated around the stage, grinding up and down his body while performing suggestive acts with a foam finger. Meanwhile, Thicke wore a black-and-white striped suit that garnered comparisons to Beetlejuice.
Cyrus' provocative dance moves sent shockwaves through the media world, and even prompted a statement from the Parents Television Council.
"MTV has once again succeeded in marketing sexually charged messages to young children using former child stars and condom commercials -- while falsely rating this program as appropriate for kids as young as 14. This is unacceptable," the organization said in a statement.
On Monday, Alan took to Twitter in defense of his son's artistic collaboration with the 20-year-old former Disney Channel star.
"Anyone expecting the VMAs to have 'Growing Pains' sensibilities does not watch videos and should be familiar with content before watching with children," the 66-year-old actor tweeted. "Don't complain, supervise!"
Robin has made no mention of the controversy, but called his performance "dope."