Katy Perry and Justin Trudeau aren't hiding their love any longer! On Saturday, the California Gurls singer and the former Canadian Prime Minister made their first official public appearance as a couple! The milestone moment was in Paris in celebration of Katy's 41st birthday... and they looked SO adorable! In photos and videos obtained by TMZ, the Woman's World songstress wore her hair back in a sleek bun and stunned in a sultry red dress. Justin matched Katy's sleek vibe with a fashionable all black suit. You can see the photos HERE.