By Joshua Mbu LAFC part-owner and actor Will Ferrell partied with fans ahead of a potentially record-breaking night, as the MLS expansion franchise aims to defend its MLS Cup against Columbus Crew. The 56-year-old, who played Buddy in the hit Christmas film Elf, was seen leading chants with adoring LAFC fans ahead of Saturday’s final at Lower.com Field. Defending champions LAFC won the title last season at their home ground but will now play at the home of Columbus Crew having finished with fewer regular season points than their Eastern Conference rivals. A win on enemy territory would see LAF…