The Prince appeared to catch Meghan's eye moments later, who began to giggle.
After the service, Harry and Meghan met about 100 children in Dean's Yard, behind the historic Abbey.
The Commonwealth Day is an annual, inter-faith event at Westminster Abbey where all 53 nations participate.
The Queen in her address praised the "Commonwealth connection" and said diversity is "a cause for celebration".
Une première ligne opérée par des autocars électriques — FlixBus
Pas du "Made in France " donc? "Ils en ont les capacités techniques mais le marché n'est pas encore suffisamment attractif". Deux cars électriques devraient circuler sur cette ligne à compter des vacances d'avril.
Lifetime have been kind enough to supply us with stills from the movie; one features Prince William and Kate Middleton alongside Prince Harry and Meghan Markle, and the second features an intimate close-up of the couple.
Meghan was dashing in a navy mid-length dress with an Amanda Wakeley white coat, a Stephen Jones beret and navy blue clutch.
Her appearance marks yet another milestone towards joining the British monarch family.
Prince Harry's American fiancée Meghan Markle on Monday took part in her first official royal engagement with Britain's Queen Elizabeth since the couple announced they were getting married previous year.
Celtics' Kyrie Irving suggests longer period of rest for sore knee
The Celtics fought hard for a 50-40 halftime lead, limiting Oladipo to just 3-for-9 from the field in the first half. While not as important as Kyrie Irving , Theis is still an important factor off the Celtics bench.
After the Queen greeted performers with a beaming smile and left, the Duchess of Cambridge and Markle bent down to accept posies from schoolgirls, before joining their partners to speak to waiting pupils.
Ms Markle described the service as "beautiful, especially the choir and the music, ' according to a visiting teacher, adding that it was 'great to see people from all over the world so well represented at the service".
"She was delighted and said she was "very, very excited".
Bills Move Up in First Round by Trading Cordy Glenn to Bengals
Many thought the Bengals may use their 12th overall pick on a tackle, or an offensive lineman of some sort at the very least. The rookie certainly showed enough promise to make Glenn expendable, especially considering his contract and injury history.