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BRITNEY SPEARS
"I'm very blessed," Spears, 24, says about being mom to soon-to-be 6-month-old son Sean Preston (with husband Kevin Federline, 27). And despite the extra paparazzi and a few controversial moments – she took heat for driving with her son on her lap – she wouldn't change a thing: "I have a great life."
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MICHELLE WILLIAMS & HEATH LEDGER
Talk about an amazing year: Williams, 25, settled in with beau Ledger, 27, got an Oscar nomination and had now-4-month-old Matilda. "Every day I'm more besotted with her," says the Brokeback Mountain actress of her daughter, who's already become accustomed to her parents' jet-setting lifestyle. "She's an excellent traveler."
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HEIDI KLUM & SEAL
She's a supermodel, designer and host of the hit Bravo show Project Runway, but "my favorite (role) is being a mom and wife," says Klum, 32. And she's grateful that husband Seal, 43, constantly takes photos of their son Henry, who turns 6 months old on March 12, and daughter Leni, 22 months. "Sometimes it's a hassle to file them away, but I'm glad we have them."
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BO BICE
The American Idol star already has career plans for 5-month-old Aiden (with wife Caroline, 25). "I've told him, 'Go be a doctor. Don't be an attorney, don't be a musician,' " says Bice. One thing's for sure, though: Whatever path the little guy chooses, the singer will be on his side. "Bo's the best dad. He loves him with all of his heart," says Caroline.
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MEG RYAN
Ryan, 44, had always wanted a sibling for son Jack, 13. She got her wish recently: Months after applying to adopt a child in China, the single actress brought daughter Daisy home. "It really gives you a lot of faith in things because you just see how there's no mistake when children are sent to you," Ryan told Oprah Winfrey.
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SOLEIL MOON FRYE
Punky Brewster is officially grown up: Six months ago, with producer husband Jason Goldberg, 35, by her side, the 29-year-old brought daughter Poet Sienna Rose into the world. "I just want to hold her every second," says Frye. "I don't believe you can spoil a child too much in the beginning."
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ROD STEWART
The rocker, 60, became a proud pop for the sixth time when fiancĂ©e Penny Lancaster gave birth to son Alastair three months ago. Next up: Stewart – whose children from past relationships range in age from 11 to 26 – and Lancaster will walk down the aisle in June.
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DENISE RICHARDS
"This has been a bittersweet year for me," says Richards, 35, of her highs (giving birth to daughter Lola, 9 months) and lows (filing for divorce from Charlie Sheen, 40). But her two young daughters – Sam is 2 – are "my first priority." Says a pal: "She's staying strong for her daughters' sake."
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JERRY SEINFELD
Seinfeld, 51 – once known as a confirmed bachelor – says of fatherhood, "Oh, I love it." And the funnyman – whose 6-month-old son Shepherd joined daughter Sascha, 6, and Julian, 3 (with wife Jessica Sklar, 35) – has found an appreciative audience. "The best laugh in the world is little kids," Seinfeld said on the Today show.
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'BIG' KENNY ALPHIN
"He's the happiest little fellow," says Big & Rich's "Big" Kenny Alphin, 42, of 4-month-old Lincoln (with stylist wife Christiev, 43). "He never cries really loud. And if he starts to whimper, I'll just harmonize with him." Lincoln is already a seasoned road warrior: He's toured with Dad and his godfather, Alphin's bandmate John Rich.
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CARNIE WILSON
"This little angel, this little Dunkin' Donut has changed my whole life," says Wilson, 37, about 10-month-old daughter Lola (with musician husband Rob Bonfiglio, 38). And after battling postpartum depression, Wilson says, she's made it through the rough period. "I have a child to feed and a spirit that can't be crushed, so I'm able to move ahead."
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