With such hits as "How to Lose a Guy in 10 Days" and "Fool's Gold" to her credit, there's no question that Kate Hudson knows how to charm romantic comedy fans. But with her latest entry in the genre, Hudson said she was thrilled with the opportunity to switch things up a bit: With "Something Borrowed," she was going to be playing something new.

"There were two of Emily Giffin's books that (producers) Hilary Swank and Molly Smith acquired the rights to called 'Something Borrowed' and 'Something Blue,' and came to me with the idea of playing the character of Darcy," Hudson recalled in a recent interview. "When I read them, I loved where the character went: I never played someone who was so deeply selfish and completely all about herself without ever thinking about the consequences."

Opening in theaters Friday, "Something Borrowed" stars Hudson and Ginnifer Goodwin as Darcy and Rachel, best friends since childhood who have come to an interesting set of crossroads as the latter turns 30. An attorney at a top Manhattan law firm, Rachel has all but the thing called love going for her, something that the magnetic, attention-grabbing Darcy is never afraid to remind her of.

But sparks finally fly for Rachel after her 30th birthday party, when she ends up in bed with Dex (Colin Egglesfield), a handsome guy whom she's had a crush on since law school. The problem is, Rachel half-heartedly introduced Dex to Darcy six years earlier, and the couple is engaged to be married -- and the wedding is still very much on and fast approaching despite Rachel and Dex's mutually genuine feelings for each other.

Hudson knew the storyline of a woman falling in love with someone, seeing him swept away by her best friend and sleeping with him after the fact, would definitely resonate with people. True, it's an entertaining scenario to see play out on the big screen, but you just know it happens it real life, too.

"I think it happens more often than people want to admit," Hudson said. "You hear about these things all of the time. I've heard plenty of stories where people have been married for years and years, and the wife and the husband's best friend couple."

But the interesting thing is, the story "Something Borrowed" isn't so much Rachel and Dex's romantic misgivings and the fallout from it, as it is the crucial time of their lives when it happens: the dreaded 30s.

"It's really about where they are in their life and their age, where they transition from their early 20s and their early 30s," said Hudson, 31. "They're going from being kids to young adults to adults. It's an integral transition in people's lives when they ask themselves, 'What am I supposed to be? What do I want to be? Am I making the right choices?' I think it can be a very tumultuous time for people."

Under the weight of that pressure, some people merely buckle, Hudson added -- and she thinks Giffin's best-seller perfectly encapsulates the feelings a 30-year-old goes through under certain circumstances.

"You often hear of a person getting married at that age, and six months later they are trying to annul their marriage," Hudson said. "They should be moving in the direction of having a family and solid career, but they get scared, so I liked that aspect of the story. Emily has a specific way of interpreting and sharing a thirtysomething point of view.

Also key to the effectiveness of the Giffin's story, Hudson praised, is the dynamic of Darcy and Rachel's longstanding friendship -- but how those ties are stretching thin.

"A lot of times people who've had relationships since childhood say to themselves as they get older, 'I love this person, but what am I getting out of this friendship? My life is changed and different now, and I don't necessarily like who this other person is anymore,'" Hudson explained. "Darcy needs her friend Rachel more than Rachel needs Darcy. I like all the questions that this movie poses, and that Emily's book makes you think about it."