R. Kelly got straight up outdone by Lady Gaga at the AMAs Sunday night and after the show, he was man (and drunk) enough to admit it. He admittedly was sauced before he even got to the after-party … and when TMZ asked for his reaction to Gaga arriving to the show on a giant horse puppet … all he could say was “why the f*ck didn’t I think of that!?!” Kelly also told them he thinks Gaga is one of the GREAT performers of our time … but where does she stack up compared to him??? Watch the clip — he’s drunk … but he’s honest!