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Canadian Prime Minister Justin Trudeau wrote on social media he is \"thinking of\" Charles \"and hoping for a fast and full recovery.\"

French President Emmanuel Macron shared his well-wishes for the King on X Monday.

\"Wishing His Majesty King Charles III a speedy recovery. Our thoughts are with the British people. Amitiés,\" he wrote.

Meanwhile, the king's daughter-in-law, Kate, the Princess of Wales, is recovering from a Jan. 16 \"planned abdominal surgery\", according to Kensington Palace.

The surgery was \"successful,\" according to the palace. Kate, 42, was discharged from the hospital on Jan. 29 after a nearly two-week stay. Kate, who is married to Prince William -- Charles' son and heir to the throne -- and is a mom of their three young kids, is now recovering at home.

Charles was 73 years old when he became king in September 2022, following the death of his mother Queen Elizabeth II, the longest-reigning monarch in British history.

ABC News' Katie Kindelan and Zoe Magee contributed to this report.

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