The Rolling Stones frontman, who dated the fashion designer for 13 years before she was found hanged at her apartment in New York on March 17, was spotted getting close to the woman who is decades his junior on his hotel balcony while in Zurich, Switzerland, last week, and L'Wren's sister Jan Shane has hit out at the star for moving on just 11 weeks after her death.
Speaking to the Sunday Mirror newspaper, she said: ''And people wonder why L'Wren was so depressed?
''These pictures make me really wonder what Mick is thinking and feeling. His daughter says that he is still heartbroken and so devastated about losing my sister.
''And then you see these photos he will never change.''
Mick cosied up to the brunette in his hotel room when the Stones performed a gig as part of their resumed world tour.
Jan, 53, claims her sister was at her happiest when she was with her adoptive parents Ivan and Lula Bambrough, who have both passed away, and is glad she has now been reunited with them.
Jan said: ''Well at least my sister is happy now. She is with mum and dad in heaven and not hurting in any way now.
''She never recovered emotionally after my father passed away, so now they are reunited she will be at peace away from this world.''
Meanwhile, friends of Mick claim he has been ''drowning his sorrows'' with women since L'Wren, 49, took her own life.
A friend said: ''Some men drown their sorrow in drink. Mick doesn't drink much but he drowns his sorrows in women.''
It has been claimed the woman he spent time with in Zurich was not the first lady to have entertained him since the death of his girlfriend.
Those close to Mick, 70, think he's gone ''back to his old ways'' and he sees sex as a coping mechanism.
A friend added: ''He grieved hard but Mick is someone who has always loved life and loves women. This is just Mick being Mick and moving on the only way he knows how.''
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