Balthazar Getty Puts the Squeeze on Sienna

Brothers & Sisters star Balthazar Getty cuddles with a topless Sienna Miller while vacationing together in Positano, Italy on Friday.

The lovebirds spent hours snuggling up to one another in their hotel bedroom, enjoying the balcony view every once in awhile.

“Sienna was literally beaming. She seemed completely at ease, very relaxed and very happy,” an onlooker said. “Balthazar had his arm around her most of the time, and they didn’t leave each other alone throughout the trip.”

Balthazar has been married to Rosetta Millington for eight years and they have four children together: Cassius, 8, Grace, 7, Violet, 4, and June, 9 months. Sienna was last romantically involved with Welsh actor Rhys Ifans.

WHAT DO YOU THINK of 25-year-old Sienna Miller fooling around with 33-year-old married man Balthazar Getty?