Hey now, Hilary Duff and ex Joel Madden’s post-split friendship is precisely what dreams are made of. Duff, 38, brought her Lucky Me Tour to New York City’s Madison Square Garden on Wednesday, August 5, where she enlisted Madden’s Good Charlotte for a special duet. In addition to Duff’s setlist of Luck… or Something tracks and throwback hits, the pop star rocked out with Joel, 47, and brother Benji Madden for a rendition of 2002’s “The Anthem,” per social media footage. Later during the show, per In Style clips, Duff changed into a vintage Good Charlotte T-shirt to perform “Why Not.” Related: Hilary Duff, Matthew Koma Dress as Madden Twins…