Bar Refaeli. Hopefully my last guess 
Right you are!
The clues:
Clue 1: I’m a super model, and I’ve been largely associated romantically with one of the best known actors in cinema.
As thewhitefrozone quickly guessed, she jumped into the spotlight because of her relationship with Leonardo DiCaprio.
Clue 2: I’m driving Spirit of Adventure crazy! (That’s a real clue, as I’ve said it before in the forums)
Well, she is
Clue 3: I have the same nationality as the last person to win the Best Actress Academy Award.
She was born in Israel, same as Natalie Portman.
Clue 4: I’ve been in a celebrated Sports Illustrated magazine cover.
She did.
Ah, there’s my fault! I assumed Portman was British 
. Ok, I am a scottish actor who many of us will soon quote in the next few years on the forums.
Billy Connolly?
Ah, man! Yes. I was wanting to hint toward his role in The Boondock Saints by saying he once he played an Irishman
Great!
Clue 1: I’m one of the most respected actors from Down Under.
You mean Australia? If so are you dead?
Yes and no.
Clue 2: I’ve voiced no less than 3 bird-like characters.
Geoffrey Rush?
True! One of my favorite actors ever.
Clue 1: I’m one of the most respected actors from Down Under.
He was born in Australia, has won the “Triple Crown of Acting” (an Academy Award, a Tony Award and an Emmy Award), has been nominated 4 times to the Oscars… In short, is VERY respected.
Clue 2: I’ve voiced no less than 3 bird-like characters.
He voiced the pelican Nigel in Finding Nemo, the owl Ezylryb in Legend of the Guardians, and Tomar-Re, a bird-like alien in Green Lantern.
I didnt realize that was himin Green Lantern 
Thats awesome!!
I am an American actress who used to play in a series of movies geared toward young audiences but has recently turned to raunchy films.
Lindsay Lohan?
No. Clue: My character in said movie series was a princess of a fictional country.
Oh, you’re probably talking about Anne Hathaway. But I don’t think she has turned to raunchy film. She has done a couple, but also a great deal of good movies.
Ah, ok. Well I red about Love and Other Drugs on [url]http://www.filmratings.com/filmRatings_Cara/#/home/[/url] and it seemed a little bad to me. Plus my aunt watched it.
Well, that one is (but her performance is excellent).
It was her then?
Yes, it was.
Ok… Let’s see…
Clue 1: I’m Swedish, and I was in the film adaptation of a celebrated graphic novel.
Malin Akerman from Watchmen ? 
Yep, she’s Swedish and portrayed Silk Spectre in Watchmen.
Your turn.