Katy Perry is celebrating 40 in style.

The “Firework” singer, whose birthday was on Oct. 25, appears to have spent the milestone day alongside friends and loved ones with an Orient Express-themed party. The celebration, which Semafor reports took place across Europe, was held last weekend.

The Orient Express was a luxury train line that ran for over 80 years, stopping in Europe’s most luxurious cities.

The iconic train is perhaps most famous for being featured in the 1934 mystery novel Murder on the Orient Express, which was made into a star-studded film featuring stars like Penélope Cruz, Michelle Pfeiffer and Daisy Ridley in 2017.

Friend and celebrity stylist Johnny Wujek shared photos from the festivities to his Instagram on Oct. 29. The celebration included period-appropriate costumes, antique train cars, and plenty of mystery-themed games.

“We Orient Expressed our LOVE for the one and only @katyperry to celebrate her 40th trip around the Sun. If anyone knows how to throw a Party it’s KP. #whataTRIP,” he wrote in the caption.

The post also featured a video of what appears to be a friend toasting Perry, with fiancé Orlando Bloom smiling in the background. 

While it looks like the former American Idol judge went all out this year, the singer has spent the past several birthdays decidedly more low-key.

While blowing out birthday candles during a small on-set celebration with fellow Idol judges in 2023, Perry said, “I’ve got everything, I’m so blessed,” in a statement to  Entertainment Tonight.  “I know what I’m wishing for, I’m wishing for peace,’ she added.

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Other birthdays have seen Perry celebrating with intimate romantic dinners, and even voting.

The “Hot N Cold” singer is mom to daughter Daisy Dove, 4, whom she shares with Bloom.