FILE PHOTO: Metropolitan Museum of Art Costume Institute Gala - Met Gala - Camp: Notes on Fashion- Arrivals - New York City, U.S. – May 6, 2019 - Lady Gaga. REUTERSAndrew KellyFile Photo (Reuters) - Pop star Lady Gaga on Tuesday announced a line of beauty products exclusively for sale on Amazon in a boost to the online retailer’s cosmetics business.