Marc Malkin

Jeff Vespa/WireImage, Dave Hogan/Getty Images

Sienna Miller may be suing the photo agency and tabloids that ran those topless pics of her cavorting in Italy with the still-married Balthazar Getty, but the globe-trotting lovebirds don't seem to be slowing down anytime soon.

The two were spotted just yesterday afternoon in Malibu, strolling through the Malibu Country Mart shopping center...

The casual pair were dressed for the beach weather: a strapless sundress for her and khakis and a V-neck T-shirt for him, according to a source.

At one point, the two took off in different directions: The Brothers & Sisters star popped into a Coffee Bean & Tea Leaf, while Ms. Miller indulged in some retail therapy at the James Perse boutique.

Perhaps they were a bit nervous that paparazzi were looming: Our source reports, "I didn't notice any PDA."

Cozy in public or not, it doesn't look like the Miller-Getty romance drama is going away. Miller's friends are now jumping to her defense, insisting she is not a homewrecker and that Getty and his wife, Rosetta, were done before the Brit actress came along.

"She and Balthazar met through friends and he was already separated from his wife," a source was quoted as saying in today's Page Six. The source claims Getty had already "been sleeping on friends' couches for six months" before he and Rosetta confirmed their separation last month.

—Additional reporting by Alexis Brunswick