Lady Gaga has announced her eagerly anticipated comeback concert will feature a surprise guest.

Three Minute Update
August 25, 2013 AT 6:26 PM
3 MINUTE UPDATE Taylor Swift introduced Ellie Goulding as, “one of my favorite artists who is so cool and very talented.” It’s a girl for Alec Baldwin and his wife Hilaria, Carmen Gabriela! Plus Michelle Williams has apparently reached out to GLEE s