Sienna Miller is a Cow

MOOOOOO

Sienna Miller and a mystery male enjoy a smoke break outside the Cow Pub in London on Monday.

The 26-year-old British actress is reportedly having relationship issues with oil heir Balthazar Getty.

A source reveals, “The couple have also had a series of rows about how much time Sienna spends socializing. While she enjoys drinking and partying, Balthazar, a former addict who stars in the TV show Brothers And Sisters, prefers a quieter life.”