and make it official at the Met Gala

They've kept their romance a closely guarded secret for years.

But Katie Holmes and Jamie Foxx cemented their couple status on Monday, when the pair posed happily for photographs at the Met Gala in New York.

The 40-year-old Dawson's Creek alum looked radiant in a purple tulle dress by designer Zac Posen. 

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They're on! Katie Holmes and Jamie Foxx cemented their couple status on Monday, when the pair posed happily for photographs at the Met Gala in New York

They're on! Katie Holmes and Jamie Foxx cemented their couple status on Monday, when the pair posed happily for photographs at the Met Gala in New York

The gorgeous sleeveless gown also boasted a long train and striking shoulder feathers.

The ex-wife of Tom Cruise wore her brunette tresses in a slicked back hairstyle from DJ Quintero, and her makeup was done by Genevieve Herr.

Katie accessorized with a sparkling box clutch.

The 51-year-old Django Unchained star matched his lady love's dress with his purple shoes, which Jamie paired with a classic suit and tie combo.  

Meeting of the minds: The 40-year-old Dawson's Creek alum looked radiant in a purple tulle dress by designer Zac Posen. She's seen here shaking hands with Cardi B [R]

Meeting of the minds: The 40-year-old Dawson's Creek alum looked radiant in a purple tulle dress by designer Zac Posen. She's seen here shaking hands with Cardi B [R]

Flawless: The gorgeous sleeveless gown also boasted a long train and striking shoulder feathers

Flawless: The gorgeous sleeveless gown also boasted a long train and striking shoulder feathers

Good hair day: The ex-wife of Tom Cruise wore her brunette tresses in a slicked back hairstyle from DJ Quintero, and her makeup was done by Genevieve Herr

The 51-year-old Django Unchained star matched his lady love's dress with his purple shoes, which Jamie paired with a classic suit and tie combo

Good hair day: The ex-wife of Tom Cruise wore her brunette tresses in a slicked back hairstyle from DJ Quintero, and her makeup was done by Genevieve Herr

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Earlier in the day, the couple had taken a ride to the event in a star-packed vehicle.

Jamie and Katie danced to music in a luxury bus, along with actors Andrew Garfield (The Social Network), Nina Dobrev (The Vampire Diaries) and Julia Garner (Ozark).

Julia had the finishing touches applied to her makeup and the lovebirds danced freely up the back of the bus.

His muse: Katie accessorized with a sparkling box clutch. She's seen here with her designer Zac Posen [L]

His muse: Katie accessorized with a sparkling box clutch. She's seen here with her designer Zac Posen [L]

Choo choo: The gorgeous gown boasted a magnificent flowing tulle train

Choo choo: The gorgeous gown boasted a magnificent flowing tulle train

The Met Gala is the annual fundraiser for the Metropolitan Museum of Art's Costume Institute and is the most glittery and exclusive event on the New York fashion calendar.

It is famous for attracting luminaries of Hollywood, of fashion, music, sports, TV and the stage for an evening of fashion and charity to mark the museum's spring exhibit.

This year, the exhibit and gala are dedicated to the idea of 'camp,' as defined by Susan Sontag's 1964 essay Notes on 'Camp.' 

The Met Gala, formally known as the Costume Institute Benefit, is always chaired by a team of high-wattage celebrities, and this year is no exception. 

The event is chaired by pop star and actress-of-the-moment Lady Gaga, tennis star Serena Williams, and singer Harry Styles, along with Gucci designer Alessandro Michele and, as always, Vogue editor Anna Wintour.

The boys: Jamie poses with The Social Network star Andrew Garfield, with whom he traveled to the event

The boys: Jamie poses with The Social Network star Andrew Garfield, with whom he traveled to the event

Riding in style: Earlier in the day, the couple had taken a ride to the event in a star-packed vehicle

Riding in style: Earlier in the day, the couple had taken a ride to the event in a star-packed vehicle

Wintour said she believes this year's Met Gala to be about 'self expression' and 'individuality', noting that she wanted to see 'outrageous, fun, tongue in cheek' fashion on the red carpet.  

The new theme seems decidedly more lighthearted than last year's hugely

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