Bianca Jagger has led tributes to L'Wren Scott.

The 49-year-old fashion designer was found dead this morning (17.03.14) appearing to have taken her own life and Bianca - the former wife of Sir Mick Jagger, who had been L'Wren's partner for the past 13 years - was among the first to pay respects.

She wrote on Twitter: ''Heartbroken to learn of the loss of the lovely and talented L'Wren Scott. My thoughts and prayers are with her family. May she rest in peace.''

Former model L'Wren was a sought after stylist and her clothing brand was very popular among celebrities, with fans including Nicole Kidman, Penelope Cruz and Michelle Obama, ensuring tributes were quick to flood in.

Khloe Kardashian - who had previously worn one of L'Wren's designs to appear on the cover of Glamour magazine - exclusively told BANG Showbiz: ''Oh my god that's horrible! When anyone passes away it's so tragic and horrible. I just pray for her family.''

Rocker turned photographer Bryan Adams, who was a friend of the designer, tweeted: ''Devastated to have lost my friend L'wren. @lwrenscott Rest in peace my dear I'm gonna miss you. Condolences to all that were close to her (sic).''

Bette Midler wrote: ''Just got news of the beautiful L'wren Scott's death perhaps by her own hand. I am devastated. A rare, wonderful, talented soul. Goodbye (sic).''

Actress Olivia Wilde said: ''L'wren Scott was brilliant, elegant, kind, and generous. S**t. My heart goes out to her loved ones. What a tragedy (sic).''

From the fashion world, designer and close friend Marc Jacobs wrote: ''Rest in peace, L'Wren Scott. You'll forever be missed.''

A friend close of L'Wren said there had been no outward signs she was unhappy before her tragic passing at her apartment in New York.

The source told the New York Post that at Christmas ''she was perfectly normal, she was giving out advice.

''I've never known her to say anything to me like 'I'm sad'. Everybody who knows L'Wren and Mick are totally and completely shocked.

''Neither of them drink and do drugs, and they were always really affectionate with each other. There were no signs of problems in their relationship.''