The 33-year-old is in the Italian capital today to accompany husband Boris Johnson as he meets with other world leaders at the summit. The group will then fly to Glasgow ahead of the Cop26 meeting in the Scottish city tomorrow.
Photographed arriving at the Colosseum this morning, Carrie looked dazzling in a red and black outfit.
The Prime Minister’s wife wore a black mask and waved to the cameras as she entered the iconic Italian landmark to join the other G20 attendees.
As with the G7 summit in Cornwall earlier this year, Carrie is supporting Mr Johnson during the United Nations Climate Change Conference this week.
Scheduled to be held in Glasgow from tomorrow until Friday, November 12, Carrie and Boris are expected to fly from Italy to Scotland ahead of the summit.
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Carrie matched her red jacket with a black dress with large red flowers.
The dress reached Carrie’s shins but featured a large slit in its centre, showing off the 33-year-old’s toned legs.
To finish off the outfit, she wore red slingback heels.
Her blonde locks were styled in subtle waves down her back, and her make-up look was minimal.
On the third day of the conference, Carrie wore her Zara red blazer – pairing it this time with a white blouse tied at the top with a black ribbon.
On her bottom half, she opted for slim black jeans and black high heels.
For the last day of the conference, Carrie was pictured arriving at the Convention Centre arm-in-arm with Mr Johnson.
She donned a stunning red dress from independent and sustainable British brand Cabbages & Roses, priced at £360.