Katy PerryandOrlando Bloomwere among the A-list guests partying the night away at the wedding rehearsal dinner fordesigner Misha Nonooand energy entrepreneur Michael Hess.

Perry and Bloom, who areengaged to be married themselves, were spotted at the event on Thursday in Rome, Italy — photographers catching them laughing while walking arm-in-arm with friends.

Later, the couple was seen sneaking a sweet kiss at the dinner table.

For the evening event, Perry, 34, wore a form-fitting, capri-length Chanel jumpsuit with double-C chain straps (the item, from Chanel’s ready-to-wear spring-summer 2019 collection, retails for $4,400 and is a favorite ofCéline DionandLily-Rose Depp).

The “California Girls” singer paired the look with simple flats and pushed back her short blonde locks with a simple black headband.

Bloom, 42, kept it casual in a white button-down shirt, grey slacks and brown shoes.

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Katy Perry and Orlando Bloom

Katy Perry.Roma/IPA/Shutterstock

Katy Perry and Orlando Bloom

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Katy Perry and Orlando Bloom

Hess, 32, and Nonoo, 31, are set to say their “I dos” on Friday at the Cinecittà, Europe’s largest film studio.

Perry and Bloom join a number of high-profile wedding guests includingKarlie Klossand Joshua Kushner (who were also photographed at the rehearsal dinner),Ivanka Trumpand her husband, Jared Kushner, andPrincess BeatriceandPrincess Eugenie.

But the biggest names on the guest list?Meghan MarkleandPrince Harry!

On Thursday, the royal couple was spotted in Rome for the nuptials.

Sources confirm to PEOPLE that the two flew via commercial airline to the Italian city and left their son,four-month-old Archie, behind. Archie is expected to be with his parents on Monday when the Duke and Duchess of Sussex head to South Africa for the start of their fall tour.

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Michael Hess and Misha Nonoo

Nonoo has been a close friend of Meghan for several years (it has been speculated that the designer helpedintroduce Meghan and Harry).

The Bahrain-born businesswoman, who was raised in London, has long run in royal circles. Until 2016, she was married to Paddle8 founder Alexander Gilkes, who is one of Harry’s closest friends. Shortly after Meghan met Harry, she and Nonoo took a trip to Spain together.

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“She is an extraordinarily supportive, kind and loving friend,” Nonoo told PEOPLE after the launch of the capsule collection last week. “From the beginning of our relationship we bonded over our shared ethos about supporting other women — it was something that we absolutely felt, and as friends who support each other over the years, you see that.”

source: people.com