Lily Allen and Stranger Things star David Harbour have reportedly tied the knot in Las Vegas.The singer and the US actor have been dating since last summer, and Allen has been pictured wearing a diamond engagement ring on several occasions this year.The Sun reports that the pair are now husband and wife after marrying in an intimate ceremony presided over by an Elvis Presley impersonator.Public records accessed by TMZ also reveal that the pair obtained their marriage license on Monday September