It happened around 2:15 p.m. Saturday in the store on the 11000 block of Roosevelt Blvd.
Investigators say the teen was shopping with her mother when she was assaulted by an unknown man.
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Police have not released any details about the circumstances of the assault.
The suspect is described as a white man in his late 30's to early 40's, wearing a dark t-shirt and light colored shorts. He was seen leaving in a mid-size tan SUV.
Police are looking for the public's help identifying the man.
Anyone with information can call Philadelphia police at 215-686-TIPS.
