It's the Oscar moment Gaga fans and many others had been waiting for since the buzz for A Star Is Born began to become more of a roar. The movie got a lot of accolades and won a Golden Globe and Grammys for the song Shallow, sung by Gaga and co-star/director/writer/producer Bradley Cooper. The pair sang the song live Sunday night for only the second time and absolutely killed it - thanks perhaps in some small part to the 128-karat Tiffany's gold diamond necklace worn by Gaga, valued at $30 million. But compared to the performance last night, the big rock played a supporting role in the performance. Enjoy. Repeatedly.