While celebrating Labor Day, Hilary Duff was seen enjoying the last day of Summer at a beach in Malibu. The star relaxed by the ocean with her son, Luca, wearing a simple two-piece by Adore Me. Instead of opting for an all-white look, Hilary went for a classic style that every woman should have in her swimsuit rotation: a black bikini. Her flattering bikini top featured a plunging neckline and had multiple straps at the back. Have a closer look at Hilary's strappy swimsuit ahead, and buy similar ones for your collection if you're feeling inspired.