Brad Pitt walks with a cane

Brad Pitt has been seen walking with a cane after injuring his knee.

"Moneyball" star Pitt, 48, was spotted exiting a Beverly Hills spa yesterday, teetering on a metal cane as he walked to his car. He wore all black, and held his phone and keys in one hand and the cane in the other.

It was not immediately apparent what his injury might be, as he did not wear a cast. But a source tells the website Just Jared that Pitt "tore his MCL." The MCL is one of the four ligaments that stabilizes the knee.

The " Tree of Life" actor was photographed on Sunday without the cane. At the time, he got on a vintage motorbike, with adopted son Pax in the sidecar, to head to the grocery store.

WireImage

Brad Pitt, seen here at a "Moneyball" screening, was spotted using a cane today.

Pitt has been nominated for a Golden Globe for best actor for "Moneyball", along with George Clooney ("The Descendants"), Leonardo DiCaprio ("J.Edgar"), Michael Fassbender ("Shame") and Ryan Gosling ("The Ides of March"). Hopefully he won't need the cane to make it up the red carpet for the awards on January 15.