Lindsay Lohan and new lover Calum Best had a furious public "screamfest" on Monday, it has been claimed.The actress is said to have lost her temper with the womanising model after he was seen flirting with several gorgeous girls behind Lindsay's back in Cipriani Downtown on Sunday night. The couple were overheard arguing in the Soho Grand hotel's lobby after returning from a night out. A source told the New York Post newspaper: "Calum was collecting numbers from all the models every time Lindsay's back was turned. It sent Lindsay over the edge. The next evening they had a screamfest in their penthouse which ended up in the lobby. Lindsay was screaming about how Calum was cheating on her."Calum's clothes were torn, and after a few minutes, they got back in the elevator and went back to their room."This isn't the first time Calum has been accused of being with other women since he started dating the 20-year-old actress. Last week, a shirtless Calum was reportedly caught in bed with another woman after asking hotel staff to restock his mini-bar at 4am. Model Sara Kova claims Calum, 26, kissed her in Bahamas nightclub Aura lastFriday and pressed his crotch against her. Kova said: "He held my hands so my butt would be pressed against his crotch.Then he grabbed by jaw and planted a kiss. I didn't know this guy's name. After I came out of the bathroom, I went back to the main room, and saw this same guy kissing Lindsay Lohan."Lindsay's friends don't approve of her romance with Calum - son of late soccer legend George Best - and are begging her to dump him.The source added: "All her friends wish Calum would go back to London. He is just using her."Lindsay's representative had no comment on the reports of a row.