Shar Jackson Wishes Kevin Federline the Best with Baby No. 5

By Reagan Alexander

UPDATED 03/30/2011 at 10:00 AM EDT • Originally published 03/30/2011 at 08:45 AM EDT

You couldn't blame Shar Jackson if she weren't overly enthused about her former boyfriend and baby daddy, Kevin Federline, expecting another child with yet another woman.

What is surprising is that actress-singer has nothing but good wishes for the man who once left her for Britney Spears, and who is now set to have a fifth child – with girlfriend Victoria Prince.

"Honestly, I wish them the best, without question," Jackson, 34, tells PEOPLE of Federline and Prince.

PHOTOS: 2011: The Year of the Baby

Rather than suggest Federline has been there and done that, the affable Jackson is a little bit Zen about the whole thing.

"It's just not part of my life," she told PEOPLE on Tuesday at the launch of Silver Jeans Co. at M. Fredric in Studio City, Calif. "I've got my own family to worry about, I can't really be worried about what's going on with anybody else. Good for them, and of course I wish them well."

The mother of four – two of them Federline's – says she's somewhat bemused when people ask her about Federline's news.

"People have been asking me what I think, or if I have a comment," she says with a laugh. "And I'm like, 'Yeah, I have a comment. I need to go home and cook for my own kids!' "