After five impressive sold-out Enigma shows of her brand new Las Vegas residency, Lady Gaga kicked off the first of a total of nine Jazz and Piano engagement shows at MGM Park on Sunday night. 

This second part of her residency brings back again the jazzy side of Gaga making the two-hour long evening unforgettable. Joined by an orchestra and longtime friend Brian Newman's band, Gaga sang stripped-down versions of her hits 'Poker Face' and 'Born This Way,' Frank Sinatra's covers of  'Luck Be A Lady' and 'Call Me Irresponsible,' as well as a surprise appearance of Tony Bennett with whom she sang 'Lady Is A Tramp' and 'Cheek to Cheek'

During the entire show, Gaga changed her outfits four times, wearing a black dress designed by her sister Natali Germanotta for the opening night featuring a deep V-neck, crystal appliqués and fringes custom made by Swarovsky exclusively for the Haus of Gaga.