U.S. actor George Clooney says he "couldn't be prouder" to be the friend of globetrotting do-gooders Brad Pitt and Angelina Jolie.

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Over the past year or so, Pitt and Jolie have traveled ceaselessly, raising awareness and offering humanitarian aid to some of the world's neediest citizens.

"I'm concerned for their well-being," Clooney said. "I'm more concerned by the idea that if you don't do those things, what does that mean? ... I couldn't be prouder to be their friend. I think that they're doing a phenomenal job. They're really committed to bringing attention. They have a very smart theory, which is, if the cameras are going to follow them, they're going to go where the cameras can do some good."

Clooney dismissed reports that Pitt and Jolie will marry at his home in Italy, adding he thinks the false rumors came from a local hotel trying to boost its business during the off-season.

"The last two years, it's been sold out in November or March -- sold out for weeks because they thought it was Brad and Angelina, Tom (Cruise) and Katie (Holmes.) That hotel is leaking the story."