The actor split from Holmes earlier this year (05) - just before the former DAWSON'S CREEK star started dating Cruise - and, though Klein admits he was heartbroken, he understands it was time for his ex to move on.
He says, "As people grow up their tastes change and I know that, growing up and becoming adults, the direction she and I wanted to go in changed a little bit. When it was time to split it was time to split and when you know you know."
Meanwhile, Klein is convinced his ex will make a great mother: "I know that when she and I had a relationship she was always very fond of kids and was always good with her nieces and nephews."
Cruise and Holmes announced the baby news in October (05), after dating for seven months.