ROYAL UPDATE: Prince William was seen shaking it off at Taylor Swift’s Eras Tour on Friday: Here’s why Kate Middleton was noticeably absent…..FULL STORY

There were a couple royal blank spaces where Kate Middleton and Prince Louis should have been during night 1 of Taylor Swift’s Eras Tour in London.

On Friday, Prince William was joined by his and Kate’s two oldest children, Princess Charlotte, 9, and Prince George, 10, for the first show of the GRAMMY-winning singer’s London run at Wembley Stadium, and Kate and Louis were noticeably absent.

ET has learned that Kate, 42, stayed home with Louis, 6, while William, George and Charlotte shook it off during the star-studded concert. According to a source, Kate — who made her public debut following her cancer diagnosis during last week’s Trooping the Color — will not attend any future shows.

“Princess Kate is not expected to attend any future Taylor concerts. Her appearance at the King’s Trooping the Color doesn’t mean she is returning to a full schedule of public engagements yet,” the source says. The Princess of Wales went public with her cancer diagnosis in March.

After Friday’s show, both William and Swift celebrated the evening with pics. The heir to the British throne took to his official social media platforms to share a selfie of him and his two oldest children with the “Blank Space” singer, 34.