Kate Beckinsale shows major sideboob in jaw-dropping dress

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Kate Beckinsale Slams Michael Bay: "Baffled By My Looks"

Kate Beckinsale clearly isn't afraid to put on a show.

The 42-year-old actress attended the Christian Dior Cruise after-party in London wearing a show-stopping ethereal gown.

Beckinsale looked innocently angelic in a floor-length white Dior gown ... until she turned to the side!

The stunning brunette showed off some major sideboob while flashing skin all the way down to her hip. She narrowly avoided a major wardrobe malfunction thanks to the two gold chains holding the slinky gown together.

Dinner And After Party - Dior Cruise Collection 2017Getty

But this isn't the first time the "Underworld" star made headlines this week.

Michael Sheen's former flame recently opened up about working with Michael Bay. She claimed Bay, who directed her in "Pearl Harbor," made her lose weight for the role.

"I don't think I fit the type of actress Michael Bay had met before," Beckinsale said during an interview on the Graham Norton Show. "I think he was baffled by me because my boobs weren't bigger than my head and I wasn't blonde."

We'd like to call her jaw-dropping look sweet, sweet revenge ...

See Kate Beckinsale through the years:

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Kate Beckinsale through the years
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Kate Beckinsale shows major sideboob in jaw-dropping dress
NEW YORK - APRIL 06: Kate Beckinsale and Ex. Michael Sheen are seen out in Manhattan on April 06, 2016 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NEW YORK - APRIL 05: (EXCLUSIVE COVERAGE) Kate Beckinsale, Lily Mo Sheen and Michael Sheen are seen in Soho on April 5, 2016 in New York City. (Photo by Alo Ceballos/GC Images)
NEW YORK, NEW YORK - APRIL 05: (EXCLUSIVE COVERAGE) (L-R) Lily Mo Sheen, Michael Sheen and Kate Beckinsale on April 5, 2016 in New York City. (Photo by Alo Ceballos/GC Images)
BEVERLY HILLS, CA - JANUARY 12: (L-R) Michael Sheen, Kate Beckinsale and Len Wiseman attends the Weinstein Company's 2014 Golden Globe Awards after party on January 12, 2014 in Beverly Hills, California. (Photo by Tommaso Boddi/Getty Images)
Kate Beckinsale and Michael Sheen (Photo by George Pimentel/WireImage)
WEST HOLLYWOOD, CA- MARCH 24: Actor Michael Sheen and actress Kate Beckinsale attend the 10th Annual Elton John AIDS Foundation InStyle Party on October 24, 2002 at the Moomba Restaurant in West Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
LONDON - FEBRUARY 4: Actress Emma Thompson and Michael Sheen, ex-husband of British actress Kate Beckinsale, arrive at the 'Sony Ericsson Empire Film Awards' at The Dorchester Hotel on February 4, 2004 in London. (Photo by Dave Hogan/Getty Images)
Michael Sheen, Lilly Beckinsale, and Kate Beckinsale (Photo by Marcel Thomas/FilmMagic)
TORONTO, ON - JULY 12: Actress Kate Beckinsale and actor Michael Sheen attend the After-Party for the Canadian Premiere of 'Harry Potter and The Deathly Hallow Part 2' at Casa Loma on July 12, 2011 in Toronto, Canada. (Photo by George Pimentel/WireImage)
Actress Kate Beckinsale and actor Michael Sheen with daughters attend the After-Party for the Canadian Premiere of 'Harry Potter and The Deathly Hallow Part 2' at Casa Loma on July 12, 2011 in Toronto, Canada.
Michael Sheen, Lilly Beckinsale, and Kate Beckinsale (Photo by Marcel Thomas/FilmMagic)
Michael Sheen and Kate Beckinsale during 2001 My VH1 Awards - Arrivals at Shrine Auditorium in Los Angeles, California, United States. (Photo by Jeff Kravitz/FilmMagic)
(GERMANY OUT) 1973Schauspielerin; Grossbritannienmit ihrem Lebensgefährten, dem britischen Schauspieler Michael Sheen, bei der Deutschlandpremiere des Kinofilm 'Pearl Harbor' in Berlin auf dem Flughafen Tempelhof (Photo by Christian Bach/ullstein bild via Getty Images)
LOS ANGELES - DECEMBER 2: Actress Kate Beckinsale and actor Michael Sheen attend the Second Annual My VH1 Music Awards on December 2, 2001 at the Shrine Auditorium in Los Angeles, California. (Photo by Ron Galella, Ltd./WireImage)
Kate Beckinsale & Michael Sheen (Photo by SGranitz/WireImage)
Michael Sheen and Kate Beckinsale during 'Romeo & Juliet' - London Premiere - Arrivals at Leicester Square in London, Great Britain. (Photo by Fred Duval/FilmMagic)
Michael Sheen and Kate Beckinsale during The Evening Standard Theatre Awards 1998 at The Savoy in London, Great Britain. (Photo by Fred Duval/FilmMagic)
Kate Beckinsale & Michael Sheen Attend The 'Haunted' Premiere In London. (Photo by Antony Jones/UK Press via Getty Images)
Kate Beckinsale and boyfriend Michael Sheen (Photo by Tom Wargacki/WireImage)
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