Two of Prime Minister Tony Abbott's most high-profile ministers claimed thousands of dollars in taxpayer entitlements for attending the wedding of close friend and Sydney shock jock Michael Smith.

It was a little less than two years ago and Smith had just left 2UE after a falling out over his attempt to raise allegations about then prime minister Julia Gillard's relationship with a former union official and the misappropriation of funds.

Taxpayer funded trip: Barnaby Joyce and George Brandis.

The shock jock did not have a best man. But two close friends spoke: George Brandis, then one of the Abbott opposition's lead attack dogs and now Attorney-General, and deputy Nationals leader Barnaby Joyce. Mr Joyce read a poem called Fair Dinkum Love. Senator Brandis made a bridal speech before dominating the dance floor.

According to travel expenses lodged with the Department of Finance, the duo collectively billed taxpayers nearly $3000 for flights, hire cars and incidental expenses incurred on the trip.