Lady Gaga and Elton John
Though they looked a little worse for the wear, Lady Gaga
and Elton John
celebrated a killer opening number backstage. Gaga wore one of the custom Giorgio Armani Prive
ensembles created just for her when she joined Sir Elton (both wore Swarovski crystal-encrusted sunglasses from Armani) onstage to belt out a medley of tunes that included "Poker Face" and "Your Song."