• Kate Middleton paid tribute to St. Patrick’s Day with a $4,000 Alexander McQueen coat and a gold shamrock brooch from the Royal Family’s private collection.
  • The duchess attended Hounslow’s St. Patrick’s Day parade alongside Prince William on Sunday.
  • The pair were spotted enjoying a pint of Guinness as they soaked up the celebrations.

Kate Middleton toasted to St. Patrick’s Day with a pint of Guinness and a custom green Alexander McQueen coat on Sunday. The duchess paid a visit to the 1st Battalion Irish Guards at their barracks in Hounslow, London alongside Prince William, where they watched the annual parade.

The duchess’ coat reportedly cost £3,000 ($3,976). She paired it with a floral fascinator from Lock & Co and £510 ($676) Gianvito Rossi heels. She also donned oval drop earrings by Kiki McDonough.

Kate and William St Patrick

Foto: Kate Middleton and Prince William.sourceSamir Hussein/ WireImage/ Getty Images

Middleton completed the look with a gold shamrock brooch – another nod to St. Patrick. The brooch is reportedly only loaned to royal members for engagements with the guards. It may look familiar to fans of the duchess, as she was pictured wearing it at last year’s celebrations.

Middleton and Prince William even downed a Guinness, much to the duchess' delight. At last year's event, she was pregnant with Prince Louis so had to opt for water instead.

Kate and William St Patrick's Day

Foto: Prince William and Middleton enjoying some Guinness.sourceGareth Fuller/ WPA Pool/ Getty Images

She then reunited with Domhall, the Irish Guards' adorable furry mascot. The royal melted hearts across the internet after she was pictured cuddling up to the Irish wolfhound during last year's parade.

Kate Middleton Irish Guards mascot

Foto: Middleton reunited with the Irish Guards' mascot.sourceKarwai Tang/ WireImage/ Getty Images

It was the second time in one week that she was spotted wearing Alexander McQueen. On Tuesday, Middleton wore a floral gown by the designer to London's Portrait Gala.

Read More: Kate Middleton rewore an Alexander McQueen gown to a glitzy London gala

Eagle-eyed fans spotted the dress was a recycled version of the gown she wore to the 2017 BAFTA Awards. But she found one subtle way to change things up.

She is known to have opted for the designer for many major life events, including for her wedding dress back in 2011.