The Rolling Stones were joined by Lady Gaga on stage as the band held their launch party for their first new album in 18 years in a club on Manhattan's West Side.The Stones, in their seventh decade as a rock 'n roll band, tore through a half-dozen songs for a crowd of hundreds at the Racket NYC club in support of the album Hackney Diamonds, which has garnered the band some of its best reviews in decades.