Mick Jagger’s ex-model girlfriend L’Wren Scott killed herself in a luxurious Manhattan apartment, police sources told The Post on Monday.

Cops found Scott, 49, hanging by a scarf inside an eighth-floor apartment at 200 11th Ave., at the corner of West 24th Street, shortly after 10 a.m. after getting a 911 call from her assistant.

It’s unclear if Scott left behind a note. There were no signs of foul play, sources said.

The 6-foot-3 brunette began dating the Rolling Stones’ frontman in 2001, and last year marked his 70th birthday by posting a vintage photo on Instagram of the rocker at age 21, wearing a pair of swim trunks, just before his band hit it big.

A spokesman for Jagger, currently on tour in Australia, said the singer was “completely shocked and devastated” by Scott’s death.

The adopted daughter of Mormon parents, she was raised in a small town in Utah as Luann Bambrough.

As a teen, she was discovered by famed fashion photographer Bruce Weber and changed her name to model for Chanel and Thierry Mugler before becoming a stylist for celebrities.

She later branched out into design, and is best known for her striking “Headmistress” dress, which has been worn by Madonna and Nicole Kidman.

Other fans of her form-flattering frocks include Naomi Cambell, Kate Moss, Sarah Jessica Parker and Michelle Obama