Reese Witherspoon was back on the field for more softball training as she filmed How Do You Know? in Philadelphia.

Paul Rudd has kept her company during their long hours on set, but this time around Reese was filming solo.   The movie has a star-studded cast including Reese Witherspoon, Paul Rudd, Owen Wilson and Jack Nicholson. 

The movie is said to revolve around a love triangle, with both Rudd’s character, a white-collar executive, and Wilson’s character, a pro baseball pitcher, both trying to win Witherspoon’s character over.

The film is set to be released in 2010.