Lady Gaga as Harley Quinn in “Joker: Folie à Deux” dropped on Tuesday with her looking devilishly in love.The “A Star Is Born” actress, 36, will portray the DC villain alongside Joaquin Phoenix in the “Joker” sequel.Director Todd Philips posted a set photo of the lovebirds for Valentine’s Day showing the baddies about to share a kiss.The close-up shot featured the “Shallow” singer with messy platinum blond hair and a bloodied mouth as she grabbed Phoenix’s Arthur Fleck close.In December, Philips revealed a first-look image of Phoenix in the highly-anticipated follow-up movie. “Day 1.