A walking advertisement for her stylish brand as she arrived at Buckingham Palace.
Wearing a chic, navy cinched skirt suit and a delicately veiled hair piece, the mother-of-four said: "I feel really proud and really excited and honoured to be here,"
McCartney, who founded her London-based fashion label in 2001, was named in the Queen's New Year's Honours List. Along with Adidas, with whom she collaborates on a sportswear line, she created the Olympic 2012 kit for Team G.B, a painstaking task which involved creating over 500 individual pieces, but which she said she would do "again and again and again".
Last year McCartney told The Telegraph how she "really enjoyed the experience" and how her brand "wasn't just plucked from nowhere, we've been doing this collaboration for eight years and it was an honest approach. It wasn't like, let's just get a British fashion designer to chuck some flag on a jacket, it was genuine."
Stella McCartney joins fellow designers Dame Vivienne Westwood and Sarah Burton of Alexander McQueen, as well as Jimmy Choo founder Tamara Mellon in being awarded the Order of the British Empire.
Also listed for Investitures this year are Tatty Devine co-founders Rosie Wolfenden and Harriet Vine, fashion writer and broadcaster Caryn Franklin and Fenwick deputy chairman while John James Fenwick.