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Catherine, Duchess of Cambridge, Kate Middleton

Samir Hussein/WireImage

Kate Middleton and Prince William were a cute couple of twinsies at their first official royal engagement for them as a couple since the birth of their daughter Princess Charlotte more than two months ago.

The pair, both 33, wore matching long sleeve navy Land Rover Bar team fleeces with zip-up collars and red piping at the America's Cup World Series, an international yacht sailing competition, in Portsmouth, England on Sunday. The backs of their tops read "Duchess of Cambridge" and "Duke of Cambridge."

Kate. who showed a slim post-baby body, wore her hair in a ponytail and paired the look with matching skinny jeans and beige and white Sebago Bala boat shoes.

The two were set to watch six sailing teams battle it out in two races, which were postponed due to bad weather.

The two did get to greet members of the British team, led by Sir Ben Ainslie, their families, who presented the royal couple with team shirts for Charlotte and big brother Prince George, 2.

Catherine, Duchess of Cambridge, Kate Middleton, Prince William, Duke of Cambridge

Chris Jackson/Getty Images

Catherine, Duchess of Cambridge, Kate Middleton, Prince William, Duke of Cambridge

Karwai Tang/WireImage

Kate and William also met with children, including kids who recently got to go sailing for the first time, thanks to the 1851 Trust charity, of which Kate is a royal patron.

Catherine, Duchess of Cambridge, Kate Middleton

LEON NEAL/AFP/Getty Images

The group "aims to inspire and engage a new generation through sailing and the marine industry, providing young people with the education, skills and training to become innovators of the future, and stewards of the marine environment," according to its website.

She and William also presented medals to the Land Rover BAR team.

The two had made their first public appearance together since Charlotte's birth in May at a royal event in June, at the 2015 Trooping the Colour parade, where they were joined by family members. There, George made his public Buckingham Palace balcony debut, where he was seen wearing an outfit William had worn as a child in 1984.

The extended royal family, minus Prince Harry, who was overseas, joined Kate and William at Charlotte's christening in England on July 5.