Return Last Used Column Letter

I need to find the last used column in the excel sheet. I used the below mentioned code to find the last used column but it gives the ouptut in integer.. for eg) output is 13 if the column is M, but I need to get M as output.. how do i do that

Sub FindLastColumn()
Dim LastColumn As Integer
If WorksheetFunction. CountA( Cells) > 0 Then
'Search for any entry, by searching backwards by Columns.
LastColumn = Cells.Find(What:="*", After:=[A1], _
SearchOrder:=xlByColumns, _
SearchDirection:=xlPrevious).Column
MsgBox LastColumn
End If
End Sub