Emmy Rossum Calls 'Shameless' Co-Star Dermot Mulroney 'Derm-ee'

Emmy Rossum takes advantage of the warm weather while running some errands around Los Angeles on Wednesday afternoon (April 8).

The 28-year-old actress ran into Petco to pick up some supplies and goodies for her feline and canine friends.

PHOTOS: Check out the latest pics of Emmy Rossum

During the latest Shameless episode, Emmy confessed on Twitter that she likes to tease co-star Dermot Mulroney about his name.

“Dermot says that in school everyone teased him and called him “Kermit”… So now on set I tease & call him Derm-ee.. not sure why #shameless,” she shared.

10+ pictures inside of Emmy Rossum heading to Petco…