Mia Thornton isn't letting her recent arrest for larceny put a damper on her b'day ... the 'Real Housewives of Potomac' star looks hotter than ever in photos posted to her Instagram Tuesday, marking her 41st birthday.

In one pic, she's wearing a white fur coat and dripping with pearls while showing off her long legs and sitting on a piano. Another photo captures her wrapped in the big fur coat while puckering her lips with a sensual stare.

In the caption, Mia writes she always picks "composure over chaos" and "grace over noise," adding that she also chooses "alignment, elevation, and elegance."

She went on to say she's staying grounded after this past week and is heading into the new year with "clarity, accountability, and gratitude." She also vowed to "rebuild," explaining that "chal

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