Rosanna Arquette Bonds with Paul McCartney over Music

Rosanna Arquette Bonds with Paul McCartney over Music
Paul McCartney and Rosanna Arquette
REX USA; Pacific Coast News

12/03/2007 AT 08:00 AM EST

So what's going on with Rosanna Arquette and Paul McCartney?

One thing's certain, the two "are spending more time together," the actress's sibling Alexis Arquette tells PEOPLE at the TV Academy's annual Ribbon of Hope AIDS charity event in L.A. on Saturday.

Last week Arquette, 48, and McCartney, 65, made international news when a British tabloid photographed the pair taking an intimate stroll through London's Hampstead Heath.

And it seems the two, who are "good friends," according to Arquette's rep, have a common bond: their love of music.

"[Rosanna] interviewed him for a documentary that she did on Rock and Roll," says Alexis. "She's been a big fan of his music for a long time, and I know that they befriended each other several years ago. "

She adds, "Who knows, if something came out of it, that's cool, it's great."

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