10/14/2008 at 12:00 PM EDT
They've cozied up in Morocco
and watched fireworks in Paris: It's good to be with Jake Gyllenhaal
, says Reese Witherspoon
"He's very supportive," the Oscar winner, 32, tells Vogue
in its November issue. "Suffice it to say, I'm very happy in life, and I'm very lucky to have a lot of really supportive people around me who care very much for me, and, you know, that's all you can hope for in life. I am very blessed in that way."
Gyllenhaal, 27, isn't the only man she's been spending time with. While on the set of her upcoming comedy Four Christmases
, Witherspoon couldn't resist costar Vince Vaughn
's sense of humor.
"Vince is the funniest person I've ever worked with in my entire life," says Witherspoon, who posed for Vogue's cover.
"There were days when we were shooting things, I would laugh so hard it would ruin the take, and I was afraid I was going to pee on myself, it was so funny."
Witherspoon – whose divorce from Ryan Phillippe was finalized
in June – says she related to the film's story of a husband and wife who must spend four different Christmases with their divorced parents.
"You don't see the blended-family Christmas very much [in movies]. And it really is a complication in a lot of people's lives now," she says. "I didn't grow up like that. I mean, my parents are still married, and my grandparents stayed married, but it's a situation my own children" – Ava, 9, and Deacon, 4 – "will have to deal with."
See ALL of Reese's PEOPLE covers!
2006: Reese and Ryan call it quits