Before Lady Gaga and Elton John drop their "Sine From Above" duet off the former's sixth studio album Chromatica this Friday (May 29), their friendship has felt destined from above since the two hit the stage at the 52nd Annual Grammy Awards together.Whether the iconic pop stars are performing across from each other on separate pianos or John is recruiting her to be the "Gaga-mother" of his children, Billboard compiled a timeline of how these two pop peas in a pod came to be.January 2010: Lady Gaga performs at the Grammys for the first time with Elton John.Before she became Mother Monster, the Fame Monster singer made her Grammy debut by opening the awards show with her Fame Factory performance, a well-oiled machine powered by fake Gagas.