Lindsay Lohan has laughed off reports she is romancing SEAN LENNON - insisting she has just been working with the rock offspring on his new music video. The 19-year-old star was spotted in January (06) partying with Lennon in plush New York nightspots Bungalow 8 and dining at Bette. But Lohan claims she simply hit it off with the son of John Lennon and Yoko Ono while she was researching her role for CHAPTER 27, which chronicles the days leading up to the murder of his beatle father by deranged fan Mark David Chapman. She says, "I got to know Sean Lennon, John's son, and I'm on the video of his next record."