Kate plus seven just doesn't quite have the same ring to it.

In an interview with Entertainment Tonight, Jon Gosselin, the former reality television star of TLC's Jon and Kate Plus Eight, says he has no idea where his 12-year-old son, Collin, is.

Jon claims his ex-wife, Kate Gosselin, says Collin is as at a school for special needs kids with behavioral problems, but he was completely left out of the loop.

"I have an idea where he is but I don't really know where he is," Jon told ET's Jennifer Peros.

According to ET, Collin is missing from the new Kate Plus Eight trailer that debuted in October and will not be in the new season.

During the interview, Jon says he hasn't seen Collin in over a year and a half, blaming Kate for taking out of the private school he was attending without consulting him.

Watch the Entertainment Tonight interview here: