Kate Middleton is back at her royal duties … visiting the community center where three children were stabbed to death during a Taylor Swift-themed dance class.

The Princess of Wales stopped by the Southport Community Centre Thursday to speak with members of emergency services … looking solemn as she and her husband, Prince William, chatted with several attendees.

KM wore a dark brown overcoat with a maroon dress underneath spotted with white polka dots … matching her man in his gray blazer and maroon sweater combo.

Remember … at the end of July, a 17-year-old went on a stabbing spree at a dance class — killing three children and injuring seven more people.

Taylor penned a tribute to the victims the following day and appeared to meet with a couple of them a few weeks later.

For Kate, this is one of the rare appearances she’s made since first announcing her cancer diagnosis back in March. She attended Trooping the Colour — a yearly ceremony for the King’s official birthday — and Wimbledon in June and July, respectively.

Her meeting Thursday seems to indicate she’s slowly making a return to public life. About a month ago, she announced she was done with chemotherapy … adding she was “looking forward to being back at work and undertaking a few more public engagements.”