Katharine McPhee - "I Know What Boys Like"

A picture from "I Know What Boys Like" starring Anna Farris, Katherine McPhee and Rumer Willis.

According to IMDb...

Release Date: August 22, 2008

Genre: Comedy

Plot outline: When Shelly, a Playboy bunny, is tossed out of the mansion, she has nowhere to go until she falls in with the sorority girls from Zeta Tau Zeta. The members of the sorority - who also have got to be the seven most socially clueless women on the planet - are about to lose their house. They need a dose of what only the eternally bubbly Shelley can provide... but they will each learn on their own to stop pretending to be what others want them to be and start being themselves.

Kat is listed as "sorority girl"

source: hollywoodbacklash; IMDb