Lady Gaga called into Z100 early this morning to wish Elvis Duran a happy birthday and give a short interview. She sang the Happy Birthday song at the beginning of the call, which was apparently sometime before 8AM. Gaga has been writing lots of music and poetry, working on a lot of songs, and that she’s been in the studio almost every day. She’s also been relaxing, and happily gaining some weight.Listen the full interview below and leave a comment on the site!