Arch-rivals Lindsay Lohan and Paris Hilton managed to stay apart at Madonna's Las Vegas, Nevada, concert on Sunday (28MAY06). The former pals fell out last year (05), when Hilton started dating their mutual pal Mary-Kate Olsen's boyfriend STAVROS NIARCHOS III. In recent weeks, Lohan has been romantically linked to Niarchos, who split from the hotel heiress earlier this month (MAY06). At the MATERIAL GIRL's MGM Grand Garden Arena gig over the weekend, Hilton was sat in row G, while Lohan was just 10 feet (3.04 metres) away in row H.