The queen appeared in a sketch before the festivities got underway.
Cook's face was sketched more than 90 years ago before the company adopted it as its official trademark.
Lilibet turned 1 on Saturday but the Duke and Duchess of Cambridge were in Wales for other engagements.
See all the photos of the royal family at Queen Elizabeth II's Platinum Jubilee Celebration
The 31-year-old DJ has not revealed who's the father.
The visit to Wales comes on an action-packed Saturday for the queen's Platinum Jubilee.
Queen Elizabeth and Kate Middleton shared messages on social media.
The singer and FC Barcelona star share two sons.
A source tells ET that Johnny Depp is looking forward to his future, following his defamation trial against his ex-wife, Amber Heard.
The TV personality will likely face off against Democrat John Fetterman in a general election.
The famous brothers are in Sin City for a five-night residency at Park MGM.
Meghan Markle and Prince Harry were seen seated far away from Kate Middleton and Prince William at the latest Platinum Jubilee event.
A source confirms to ET that Queen Elizabeth II finally met Prince Harry’s little girl, Lilibet, at Trooping the Colour on Thursday.
The 'Pirates of the Caribbean' actor scored a huge win, and payday, in court on Wednesday.
