Are you looking, Jamie? Lily Collins shows ex-boyfriend and co-star what he's missing in racy dress at The Mortal Instruments: City Of Bones premiere

By IONA KIRBY

PUBLISHED: 05:07, 13 August 2013 | UPDATED: 06:41, 13 August 2013

They say that looking good is the best revenge.

And Lily Collins’ ex-boyfriend Jamie Campbell Bower would no doubt have been kicking himself on Monday.

The former couple were in attendance at the Los Angeles premiere of their movie The Mortal Instruments: City Of Bones.

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White hot: Lily Collins was a vision at the LA premiere of The Mortal Instruments: City of Bones on Monday

And leading lady Lily pulled out all the stops to ensure her look was jaw-dropping – and easily succeeded.

The 24-year-old sported a tight white dress with a top half that was cut and slashed so much that practically just her modesty was covered with flimsy bits of fabric.

The daughter of Phil Collins slicked her chestnut brown tresses into a neat ponytail so that the full effects of her racy frock and bare flesh could be seen.

Flashing the flesh: The actress oozed sex appeal with her racy slashed dress and vampish make-up

The best revenge: Lily showed ex-boyfriend and co-star Jamie Campbell Bower what he's missing

Tatt's heartfelt: Lily showed off her back tattoo which reads 'Love Always and Forever'

Lily, who topped off her outfit with white pumps, went for an all-out vampish look as far as her make-up was concerned, with deep red lipstick, smoky eyes and her trademark bold and dark eyebrows.

A tattoo on Lily’s back, which she got in November while in a relationship with her co-star, was visible and reads ‘Love always and forever.’

Lily and Jamie were first romantically linked in July 2012 after meeting on set of the film, and are believed to have split recently after one year together.

Keeping their distance: Lily posed with co-star Kevin Zegers but didn't walk the carpet with leading man Jamie

The woman behind the vision: Lily posed with Cassandra Clare, who penned the Mortal Instruments series

The pair walked the red carpet separately, but posed side by side for a group shot, and Jamie was no doubt looking on while Lily showed him what he is missing.

The actor, also 24, chose a bold cobalt blue three-piece suit for the occasion, along with black patent lace-up shoes.

Teen idol Bella Thorne looked lovely without stealing the spotlight from the stars of the movie, in a printed monochrome dress with lots of pink lipstick.

Kicking yourself? Jamie played it cool on the carpet but no doubt was bowled over by his former flame

Amicable: Jamie and Lily didn't mind posing side by side and playing nice during a group shot

All together now: (L-R) Jared Harris, Kevin Zegers, Jamie, Lily, Robert Sheehan and Godfrey Gao

And Julianne Hough went for a smart casual look in an embroidered floral top, high-waisted red tailored trousers and white sandals.

Kevin Zegers was in attendance too, along with his new wife Jaime Field, and the pair looked every inch the blissfully happy newlyweds.

Red-dy to rumble: Julianne Hough turned heads in bright tailored trousers and a pretty embroidered top

Prints charming: Bella Thorne wore a black and white dress with an unusual pattern, and lots of pink lipstick

Leggy ladies: Molly Tarlov (L) and Ashley Greene wore short party dresses for the occasion

There was also something of a British invasion as along with Jamie, and Lily who was born in England, Nathan Sykes from The Wanted and Misfits star Robert Sheehan were in attendance.

The movie follows a teenage girl who goes on a life-changing quest after her mother is attacked and taken by a demon.

The film, based on the first book from the Mortal Instruments series by Cassandra Clare, is out in the US and UK on August 21.