Princess Diana(01 of25)
Open Image ModalIt was the LBD seen around the world. A 32-year-old Princess Di stole the show at the Superpentine Gallery benefit wearing a curve-hugging minidress and her famous pearl choker in 1994. (credit:Jayne Fincher/Getty Images)
Princess Diana(02 of25)
Open Image ModalA heavily pregnant Diana watches Prince Charles play polo in 1982 in a long pink button-up nightgown. Even Di could make sleepwear look cute. (credit: David Levenson/Getty Images)
Princess Diana(03 of25)
Open Image ModalA sexy one-shoulder gown was the epitome of Di's flair for fashion. We can't picture Kate Middleton wearing anything like this. (credit:Patrick Riviere/Getty Images)
Princess Diana(04 of25)
Open Image ModalThis is the outfit that Di wore when she announced she was pregnant with her first child, Prince William, in 1981. We love the fringe! (credit:Jayne Fincher/Princess Diana Archive/Getty Images)
Princess Diana(05 of25)
Open Image ModalThe Princess of Wales wears a stunning one-shoulder white and silver gown designed by Catherine Walker. We wish we could wear massive tiaras too. (credit:Tim Graham/Getty Images)
Princess Diana(06 of25)
Open Image ModalDi's great friend, the late fashion designer Gianni Versace, designed the Jackie Onassis-inspired pink suit and Philip Somerville designed her chic pillbox hat in 1995. (credit:Getty Images)
Princess Diana(07 of25)
Open Image ModalEvery woman wanted to wear this navy velvet dress after Diana was photographed dancing with John Travolta in 1987 at the White House. (credit:Getty Images)
Princess Diana(08 of25)
Open Image ModalThe Princess channels Grace Kelly while making an appearance at the Cannes Film Festival. (credit:Tim Graham/Getty Images)
Princess Diana(09 of25)
Open Image ModalThis sparkler, designed by Catherine Walker, makes us want to go to the disco. (credit:Tim Graham/Getty Images)
Princess Diana(10 of25)
Open Image ModalBack when she was known as Lady Diana, before her marriage to Prince Charles, she rocked a piecrust frill, which became a Diana trademark. (credit:Anwar Hussein/WireImage)
Princess Diana(11 of25)
Open Image ModalPrincess Diana(12 of25)
Open Image ModalPink gingham trousers and a matching pink jumper? You go, girl! (credit:Tim Graham/Getty Images)
Princess Diana(13 of25)
Open Image ModalThe Princess favoured dresses that showed off her svelte frame. Di wore this Versace dress to a charity concert in Italy. We doubt the Queen would allow Kate Middleton to wear dresses like this. (credit:Tim Graham/Getty Images)
Princess Diana(14 of25)
Open Image ModalDubbed the "Elvis dress," Diana wore this pearl-encrusted bolero and gown at the British Fashion Awards in 1989. (credit:Getty Images)
Princess Diana(15 of25)
Open Image ModalAs rumours of her romance with Prince Charles were beginning to swirl, a covered up Lady Diana Spencer was spotted leaving the Ritz Hotel in London after attending Princess Margaret's 50th birthday party in 1980. We love the hint of pleated pink under her coat. (credit:Jayne Fincher/Princess Diana Archive/Getty Images)
Princess Diana(16 of25)
Open Image ModalAttack of the purple! Diana wore this beaded ball gown and her Spencer tiara at a banquet in London. (credit:Tim Graham/Getty Images)
Princess Diana(17 of25)
Open Image ModalThe lady is a vamp! Diana goes matchy-matchy in Argentina, 1995. (credit:Tim Graham/Getty Images)
Princess Diana(18 of25)
Open Image ModalDiana knew the value of wearing a hat for sun protection. Of course, the hat had to match her suit. (credit:Anwar Hussein/WireImage)
Princess Diana(19 of25)
Open Image ModalWearing another Catherine Walker creation, the Princess of Wales donned a strapless floral evening gown while in Australia, 1988. (credit:Tim Graham/Getty Images)
Princess Diana(20 of25)
Open Image ModalDiana really did love to match her accessories to her dress. (credit:Julian Parker/UK Press via Getty Images)
Princess Diana(21 of25)
Open Image ModalShe kind looks like a flight attendant, no? (credit:Georges DeKeerle/Getty Images)
Princess Diana(22 of25)
Open Image ModalDiana made military wear chic before Michael Jackson. (credit:Georges DeKeerle/Getty Images)
Princess Diana(23 of25)
Open Image ModalEven when she's dressed down, Diana still looks effortlessly chic in tanned slacks, loafers, a button-up white shirt and sunnies. Classic! (credit:TIM GRAHAM/AFP/Getty Images)
Princess Diana(24 of25)
Open Image ModalOn the day they announced their engagement in 1981, Lady Di wore a blue blazer with a matching skirt and a white blouse with a chic neck bow, bought from Harrods, while Charles wore a traditional grey wool suit and tie. (credit: Tim Graham/Getty Images)
Princess Diana(25 of25)
Open Image ModalPrincess Di was rocking power suits way before Hillary Clinton. (credit:Anwar Hussein/WireImage)