Kate Gosselin's Dramatic Makeover!

At 34, Kate Gosselin looks thinner -- and younger! -- than she did in 2004, thanks to a little help from TLC. The network filmed her tummy tuck (worth $5,000 to $8,000), plus arranged teeth-whitening for both Kate and Jon (about $500), reports the newest issue of Us Weekly, on stands now.

The mother of 8 is "obsessed" with tanning, a source tells Us. She even swung by a salon to fake bake on Mother's Day! The manicured mom also recently quit the Spring Valley Athletic Club to work out solely with a personal trailer, Us reports.

As for her famous spiky do -- which, when mentioned, earned her a "You go girl!" from an audience member at a Troy, Michigan promotional appearance last night -- Kate says it reflects her feisty personality.

"It's my attitude! Everybody wants it. It's work," she tells Entertainment Weekly. "I have very, very thick hair, so it's not going to work for everybody," she continues. "I've seen people come through the book line with thin hair and it just won't work. My hair stylist gets calls from all across the country."