Sienna Miller apparently doesn't mind if a guy comes with baggage, which, in the case of Balthazar Getty, includes a tattoo of his wife's name over his heart. The British tabloids are in a tizzy over photos of the semifamous starlet, 26, sharing several passionate kisses with the actor, 33, during a recent boat ride off the Amalfi Coast in Italy.

Both opted to forgo their shirts for the excursion, which not only gave shutterbugs a clear view of Miller's, oh, let's say cannolis, but also Getty's "Rosetta" etching, a tribute to his reportedly divorce-planning, clothing-designer spouse of eight years, with whom he has four children (their youngest, June, was born last October).

"They were all over each other for the whole afternoon," an eyewitness tells the London Sun. "They had no qualms about showing the world they were together. There was lots of kissing and cuddling."

The pair was purportedly introduced by Balthazar's "Brothers & Sisters" co-star Matthew Rhys, who was linked to Sienna last year and appears with her in the upcoming drama "The Edge of Love."

Two weeks ago, the actor, who is an heir to his great-grandfather Jean Paul Getty's oil fortune, denied rumors that he was involved with Miller or that his marriage had gone belly-up.

"It's not true," he insisted to the London Daily Mail. "No truth, no truth to any of that."

His Italian interlude with Sienna -- they were also snapped getting handsy on a balcony, with the actress once again displaying plenty of nipular action for the paparazzi -- has led some to question their seeming lack of discretion (granted, he's the one who's married, not Miller, but wouldn't it be prudent to remain somewhat under-the-radar until his tattoo is at least lasered off?).

"Sienna is not a homewrecker," a source insists to Us Weekly (check out a SFW pic of their smooch-filled, shirts-optional boating trip here.) "It's been over with him and his wife for some time. I believe he'll be making an announcement shortly."

Still, a spy tells the London Daily Mirror, "Sienna is totally besotted with Balthazar. Their relationship has gone from strength to strength over the past month and Sienna finds him utterly irresistible. Balthazar arranged for the trip to one of the most beautiful and exclusive parts of the [Mediterranean]."

Continues the insider, "Sienna is so relaxed in his company and has been telling her inner circle she's never been so in love. It's early days -- but she looks completely smitten."

It's a quick rebound for Jude Law's onetime fiancée, who ditched actor Rhys Ifans last month after nearly a year of togetherness.

"I really thought I was very ready to settle down," she told the London Telegraph shortly before the split was made public, "but then I realized I wanted to be selfish for just a little bit longer."

Ifans, for his part, insists he's not pining away for his ex.

"[Bleep] Sienna, I'm over it," he shrugs to Britain's The People. "Everyone thinks I am sad. I was, but I'm not anymore. I know people have been worried about me but there is no need, honestly. I'm fine. I'm having a great time. I won't be going for any more wrong 'uns though."

Next: Baby Talk: Nicole Gets Gifted, Jen Looks Swell