Tackling yet another project, Hilary Duff was spotted on the New York City set of “The Business of Falling in Love” today (October 20). The “Lizzie McGuire” actress looked lovely as she filmed scenes and chatted with costars and crewmembers, sporting a green blouse teamed with a leopard print skirt, white stockings, and black heels.  Following a new episode of her hit CW show last night, you can catch Hilary when “Gossip Girl” returns next Monday with another new installment titled “Enough About Eve”.Per the show’s Web site, a synopsis tells: “In need of publicity for his new hotel, Chuck (Ed Westwick) decides to move up his club’s opening and enlists Serena’s (Blake Lively) help to get the word out to her celebrity clients. Feeling left out of the planning, Blair (Leighton Meester) attempts to win Chuck’s approval by secretly helping him with a problem concerning opening night. Dan (Penn Badgley) is unnerved when he finally watches one of Olivia’s (guest star Hilary Huff) infamous sex scenes with co-star and real-life boyfriend at the time, Patrick Robinson (guest star Simon Miller). Jenny (Taylor Momsen ) is forced to choose between her relationship with Eric (Connor Paolo) and her new role as Queen Bee. Rufus (Matthew Settle) gets Lily (Kelly Rutherford) into the Halloween spirit.”