After revealing she'd had two ectopic pregnancies in her 20s, Heather gives birth to the couple's "little beauty," baby Beatrice (with her parents in '04). "I want to be a proper mum as much as I can," she said. Photo by: BAUER-GRIFFIN
We Can't Work It Out| Divorced, Heather Mills, Paul McCartney
"She was always wanting him to use his celebrity [to promote hercauses], and he just looked so utterly miserable when she asked," says a source who knows them. "He wouldn't say no to her, but he'd try to put her off a bit." Furthermore, "their styles of dealing with people were so different. He would listen to people and she keeps interrupting with statistics. It's very hard to get a word in when she gets started. You got the feeling he would have been happy with his music and his kids and his farm."

Sure, "he likes the farm," counters another friend, "but he is far more cosmopolitan and much more of a doer. It is so wrong to picture him in a rocking-chair kind of scene." In March he and Heather teamed up for a trip to Canada's Prince Edward Island to draw attention to the killing of baby seals for their skins. Though by some accounts they had already been shaky for months, on their way to a television interview, "they just started singing, 'All We Are Saying Is Give Seals a Chance,'" recalls Rebecca Aldworth of the Humane Society of the U.S. "They both sang together the whole way into the studio. It was very sweet."

As the pair now go their separate ways – he's at home after a vacation to France; she returned to England after a two-day visit to Slovenia, where she has friends from her activist work – they are focused on their little girl. "This separation will not stop Paul from being a good father, as he has always been," says May Pang, a longtime friend of McCartney's and former girlfriend of John Lennon. As for Heather, "She is a very strong person," says her friend Wendy Walker. "There is a lot of caring on both sides here. They are just hoping to have some time, like everyone who goes through this, to move on."

• By Michelle Tauber. Pete Norman, Courtney Rubin, Simon Perry, Neil Michael, Ellen Tumposky and Liz Corcoran in London, Oliver Jones in Los Angeles, Kathy Ehrich Dowd and Natasha Stoynoff in New York City