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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