By JOCELYN NOVECK, AP National Writer The A-list is back. How A-list? Try Lady Gaga and J. Lo. Inauguration officials announced on Thursday that the glittery duo would appear in person on Jan. 20, with Gaga singing the national anthem as Joe Biden and Kamala Harris are sworn in on the West Front of the U.S. Capitol, and Jennifer Lopez giving a musical performance. The announcement comes a day after