“Fast & Furious” star Vin Diesel celebrated his 55th birthday in Rome by having dinner with an unlikely guest: Helen Mirren.

The two actors were spotted at celebrity haunt Antica Pesa — which has a sister location in Brooklyn — where they were joined by one of the producers of their current film, “Fast X.”

A spy exclusively told us: “Diesel was wearing a blazer, which he then took off to reveal a tank top, fitting for the scorching temps.”

Vin Diesel and Helen Mirren.
Vin Diesel and Helen Mirren have grown close while filming “Fast X” in Italy.vindiesel/Instagram
The spy said that the action stalwart “sat in the restaurant’s garden and sipped on red wine with Mirren, switching over to prosecco for the birthday moment.”

We hear the stars and their party ordered Italian classics like cacio e pepe and smoked duck, and that “Diesel was surprised by the kitchen with his favorite cake, Victoria sponge.”

Helen Mirren and Vin Diesel film a touching scene in Rome.
Helen Mirren and Vin Diesel film a touching scene in Rome.ROME / MEGA
Said the Roman source, “They were having an amazing time — it seems as if Diesel and Mirren have become good friends throughout filming. As they sang him ‘Happy Birthday,’ he changed the lyrics to ‘Happy birthday, dear Helen,’ because her birthday is July 26.”

Diesel’s birthday was Monday.

Mirren has said she asked Diesel for a role in a film at a Hollywood party.
Mirren has said she asked Diesel for a role in a film at a Hollywood party.Getty Images
Mirren, 76, has previously said that she asked Diesel, 55, for a role in the film when she saw him at a party, quipping that she “introduced myself and shamelessly begged him to put me in one of his movies.”

Mirren’s surely happy to finally be part of the family. She’s also been spotted tenderly touching Diesel’s face on the set while filming their upcoming action epic.