In a '60 Minutes' special airing Sunday, Lady Gaga and Anderson Cooper visit the pop icon's old New York apartment, where she lived before she was, well, Gaga.

In order to gain access to her old studio apartment, Gaga buzzes all of the buzzers on the building door -- the "New York way" -- so that someone will let them in. Unfortunately, the current tenant in Gaga's former abode is camera shy, so Cooper and Stefani Germanotta -- as she was once known -- sit in the stairwell and sift through a box of mementos, like the first song Gaga ever wrote.

Despite everything he's seen in his career, Cooper says even he was excited about his time with the world famous 'Born This Way' singer. "I was really interested to meet Lady Gaga. She's obviously a fascinating person," he says. "What's great about '60 Minutes' is you spend a lot of time with the person you're profiling. So to be able to spend a couple weekends with her in various places over the course of several months, it's really cool," Cooper continued. "And it's really interesting and I'm learning stuff about her I never saw before."

Tune in Sunday pre-Grammys to get a backstage pass into the life of Lady Gaga on '60 Minutes,' which airs at 7PM ET/PT.

Watch Lady Gaga and Anderson Cooper Visit Her Old Apartment