Britain's Prince William (L) and his fiancee, Kate Middleton, help to drive a fence post into the ground at Greenmount Agriculture & Food College, in Antrim, Northern Ireland March 8, 2011. Cheering crowds and armed police greeted Prince William as he flew into Northern Ireland on Tuesday to show off his bride-to-be Kate Middleton. REUTERS/Phil Noble (NORTHERN IRELAND - Tags: ENTERTAINMENT SOCIETY ROYALS)