Lady Gaga -- Center of Attention at Weinstein Pre-Oscar Bash (PHOTO)

Lady Gaga and bf Taylor Kinney hobnobbed it with Lana Del Rey at a swanky pre-Oscar party.

Gaga -- who had performed in WeHo with Elton John hours earlier -- rubbed elbows at Harvey Weinstein's big bash in Bev Hills at the Montage hotel.