Sienna Miller was surrounded by friends as she celebrated Halloween in London on Friday night, but Balthazar Getty was nowhere in sight. Despite their recent Italian vacation [1] and kissy stop in NYC [2], trouble is apparently brewing between the duo, who are said to be taking a break [3] because he is bothered by her partying and she's insecure about his continued contact with his wife. Sienna's keeping her mind off her love troubles with socializing and work — she looked happy grabbing a drink with a friend today, and she recently appeared in a strange Damien Hirst-directed music video [4] for UK band The Hours. Sienna and Balthazar might not be able to go the distance together, but it doesn't seem like there would be too many broken-hearted fans if they didn't last.

[5]

Splash News Online [12] and Bauer-Griffin Online [13]