Shock, horror, I’m hearing that Sienna Miller has called time on her relationship with Balthazar Getty after just under a year.

The pair’s off/on relationship apparently came with too much baggage for commitmentphobe Sienna, who is famous for getting bored of her beaus after a few months. Getty, who has four kids with his wife Rosetta, only officially split with her after he was seen frolicking with a topless Miller on a boat last year…