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Valentine's Day was a working day for Duchess Kate, who made a second appearance this week to promote one of her charities.

The Duchess of Cambridge today officially inaugurated an art therapy room at Northholt High School in London built by The Art Room, for which she is royal patron.

She wore a striking "snorkel" blue sheath by L.K. Bennett called the Detroit Notch Collar fitted dress, paired with black suede pumps and a black clutch, according to the HRHDuchessKate blog.

It was only the second public appearance for Kate so far this year, except for paparazzi shots while she was on vacation in the Caribbean.

It also was the second time she spent Valentine's Day on a public engagement; in 2012, she visited Liverpool while Prince William was on duty in the Falklands with his RAF helicopter squadron.

For today, Kate's jewelry was low-key and simple, unlike Tuesday when she attended a gala at another of her charities, the National Portrait Gallery, wearing an inky blue Jenny Packham gown and a dazzling diamond necklace borrowed from the queen.

Today's event was more focused on the practical uses of art. At the high school, she greeted staff and students, and sat in on a short Art Room session to learn how the school and the charity will work together.

Her press people tweeted a picture of her at a table with students. The Telegraph posted a video.

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