Start them up!

Leonardo DiCaprio and his girlfriend, Vittoria Ceretti, showed rare PDA while attending the Rolling Stones’ concert in Las Vegas on Saturday night.

The Oscar winner, 49, and the model, 25, were seen canoodling in a VIP section at Allegiant Stadium while watching the English rockers bring down the house on their “Hackney Diamonds” tour.

Ceretti was spotted kissing DiCaprio multiple times, and she also claimed her territory by keeping her arm wrapped around his shoulders.

The “Wolf of Wall Street” star was dressed in his usual incognito uniform comprised of a black T-shirt and a baseball cap pulled low over his face.

The Italian beauty, for her part, looked casual in a white off-the-shoulder top layered over a black bra. She completed the look with a black miniskirt, sheer black tights and black boots, mirroring DiCaprio by wearing a hat.

Ceretti shared several photos from her Sin City outing with her boyfriend on Instagram Sunday.

“9 hours in Vegas 🤘🏼,” she captioned the post.

In the snaps, the Vogue cover girl wore the same outfit as the concert while posing in what looked like a lavish hotel suite.

She also included two videos of Mick Jagger performing hits including “Paint It, Black” and “Sympathy for the Devil.”

Just days prior, Ceretti made a splash at the 2024 Met Gala in New York City in a structural cream gown by Pieter Mulier for Alaïa.

She was spotted staying at the Mark Hotel before heading off to several afterparties, though it is unclear whether DiCaprio joined her after fashion’s biggest night.

DiCaprio and Ceretti have been romantically linked since last August when they were spotted embraced in a dance floor makeout at a club in Ibiza, Spain.

Since then, the duo has stepped out on multiple occasions together, including with each other’s families.

Last fall, a source told Page Six that DiCaprio and Ceretti were more than just a fling.

“They’ve been spending quite a bit of time together over the past few months, and they’re enjoying getting to know one another on a deeper level,” the insider said at the time.

In March, they sparked engagement speculation when Ceretti was seen wearing a sparkly ring on her left ring finger.

However, sources close to the actor told us there was “zero” truth to the rumors.