Kate chose a grey coat-dress by Catherine Walker for the occasion.
The monarch and Duchess of Cambridge had the same event on the calendar today as they stepped out with one another for a visit to King's College.
"The Queen is Patron of @KingsCollegeLon - which is the 4th oldest university in England".
The Queen looked lovely in a rose pink Stewart Parvin cashmere coat with a matching hat by Rachel Trevor Morgan, paired with a pink sapphire and diamond brooch.
Catherine and the Queen shared a blanket together in the back seat. Source Getty
During their visit, the two women watched robotics demos, including a robotics surgery, met students and professors on the virtual trading floor and explored one of the location's two new roof terraces, where they met builders and architects who helped convert Bush House from the BBC's World Service headquarters.
The public outing marked Middleton's first event alone with Queen Elizabeth II since she and Prince William Wednesday in 2011, E!
They went to King's College's London Strand campus to see Bush House, a recently renovated part of the campus, and meet with people who took part in the project.
James noted that while the Queen likes both Kate and Meghan, their relationship's vary greatly: "Kate and the Queen tended to use signals of evenly-based friendship but Meghan and the Queen look more like a grandmother and a much-loved grand-daughter". Her most business causal was during her visit to the Henry Fawcett Children's Centre.