Prince Philip, the 99 year-old husband of Queen Elizabeth, was reportedly rushed to the King Edward VII Hospital in London on Tuesday night so that his health can be monitored.

In a statement obtained by Entertainment Tonight, Buckingham Palace said that Philip was hospitalized as “a precautionary measure” on the advice of his doctor after he reported that he was not feeling well.

“The duke is expected to remain in the hospital for a few days for ‘observation and rest,'” the statement continued.

A royal source has since come forward to say that Philip was taken to the hospital by car, and that he was able to walk inside himself without any assistance. The insider also tried to reassure the public that this is just a precautionary amidst the pandemic, and that Philip’s illness is not COVID-19 related.

Philip and the Queen each received their coronavirus vaccines last month, which is something they went public about in the hopes of encouraging others to get the vaccine as well.

This comes days after it was reported that Philip and the Queen were “delighted” to hear that their grandson, Prince Harry, and his wife Meghan Markle were expecting their second child.

“Her Majesty, the Duke of Edinburgh, Prince of Wales and the entire family are ‘delighted’ and wish them well,” a palace spokesperson told People Magazine.

Harry and Meghan had announced that they were expecting earlier in the day.

“We can confirm that Archie is going to be a big brother. The Duke and Duchess of Sussex are overjoyed to be expecting their second child,” a spokesperson for Harry and Meghan said.

Ingrid Seward, author of the new book “Prince Philip Revealed: A Biography,” recently opened up about how devastated the 99 year-old was about “Megxit” last year.

“It all came as a huge shock,” Seward explained. “If Prince Philip would have been younger, he would have been more influential. He would have told Harry, ‘Are you sure you know what you’re doing? Do you know what you’re giving up? You cannot have one foot in the palace and the other foot out. You have to make a decision and I don’t want you to regret it.’”

“Internally, Philip was very upset, but he wasn’t going to let Harry see that,” Seward added. “And he’s always going to support his wife, [Queen Elizabeth II]. He knew that Harry and Meghan leaving would be damaging to the monarchy because people will then say, ‘What’s so awful that this young couple couldn’t bear to be part of it?’”