The Arquette siblings are many things, but shy is not one of them. That holds especially true for colorful sister Alexis, whose cross-dressing fabulosity puts her back in the headlines from time to time. Now, it seems, she is even willing to spill the beans on 48-year-old sibling Rosanna’s rumored relationship with Paul McCartney. (The two were recently spotted canoodling outside of the former Beatle’s North London home.) According to Ms. Arquette, the two “are spending more time together,” bound, she said, by their love for music. “[Rosanna] interviewed him for a documentary that she did on Rock and Roll," Ms. Arquette added to People over the weekend at a TV Academy’s annual Ribbon of Hope AIDS gala. "She's been a big fan of his music for a long time, and I know that they befriended each other several years ago. Who knows, if something came out of it, that's cool, it's great."