Diane Warren and Lady Gaga have written a new song together! Speaking to MusicWeek, the legendary songwriter revealed that the two penned a second track, following the critically-acclaimed "Til It Happens to You." "I'm not against co-writing with an artist," Warren, who is known for writing songs entirely on her own, said. "I wrote something with Lady Gaga that’s coming this year. So, every now and then, I’ll write with somebody. But I won’t get in those rooms. I won't go to a writing camp