Dancing with the Stars contestant Kate Gosselin has gone Hollywood -- and her eight kids back home in Wernersville, Penn. don't like it one bit.

Less than three months after Kate and Jon Gosselin's divorce was finalized, their 9-year-old twins and 5-year-old sextuplets are struggling with even more upheaval: DWTS has their mom 2400 miles away for at least three days a week.

In fact, as she trained and promoted her DWTS stint (the show debuts March 22), Kate, 34, spent Feb. 21 to March 5 away from the kids, a source confirms in the new issue of Us Weekly.

Minded by five nannies in her absence, the kids "were asking, 'When is Mommy coming home?'" an insider tells Us.

Twins Cara and Maddy "seem depressed when Kate isn't around," another source says. Five-year old sons Aaden, Collin and Joel, meanwhile, "got into trouble at school for talking back to teachers," adds the source.

But their mom, who "wants to be a huge star," justifies her work with a surprising comparison -- to Brad Pitt and Angelina Jolie!

"She says Angelina Jolie and Brad Pitt have lots of kids and their parents are away for long periods, working to support them," a family insider tells Us.

To read more about how Kate is "totally driven" to make it in showbiz, how she blew off Q-time with the kids for the tanning salon, what she told Us about DWTS and where Jon is lately, pick up the new issue of Us Weekly -- on newsstands today!