Katy Perry does GTL

Katy Perry sports a Jersey Shore-inspired GTL shirt as she goes shopping in West Hollywood. The 25-year-old singer was joined by stylist Johnny Wujek and BFF Markus Molinari on her trip, making stops at the Fred Segal and Ron Herman boutiques!

Earlier in the day, she was seen working out with celeb trainer Harley Pasternak. FYI: GTL stands for "gym, tan, laundry," the essential pre-party schedule for the Jersey Shore guys!