Robert Pattinson will appear in an upcoming advertisement for fashion label Christian Dior and according to an insider the ad is so hot that his girlfriend, Kristen Stewart, will be "livid."

A insider connected to the French fashion house said that the upcoming ad campaign starring the Cosmopolis star is super steamy. The British hunk will be "shirtless while simulating a foursome with three hot blond models," the source told Life & Style.

In another scene, "Rob and the model are in a swimming pool making out and he's seen giving her a blow back with a cigarette at one stage, too."

Upon finding out about the upcoming project "Kristen will be livid," the insider said, adding that the actress "has no idea what she's in for."

The Christian Dior ad campaign starring Pattinson with a bevy of gorgeous models will run on television and billboards for about a year, according to the report. It is so sexy that it is considered "one of the most eagerly awaited adverts in years."

Pattinson and Stewart have been inseparable since he returned to the States mid-March from his nine-week shoot in Australia to film The Rover. The couple was spotted at the restaurant Ye Rustic Inn in the Los Feliz area in Los Angeles on March 17 and again, two days later, with their pal Katy Perry. They also spent Easter weekend together in Malibu.

"Rob and Kristen celebrated Easter together at her mom's house in Malibu," a friend of the couple's told Hollywood Life. "It was low-key and Kristen's brothers were there as well."

A Twilight fan shared his shock on Twitter when he saw the couple in Marfa, Texas, a quaint town with only 2,000 residents, on April 5.

"In 4 hours in a West Texas town of 2000, I've run into an old friend from SF, Millie from Freaks and Geeks, and Kristen Stewart," the fan tweeted.

The following day three more people tweeted their sightings of the Hollywood power couple. A Marfa resident tweeted, "OMG, I think I just saw Kristen of Twilight here, in Marfa with a red-hair-girl and her boy." 

"Robert Pattinson in Marfa!!!" wrote another on Twitter. 

Tags: Robert Pattinson Kristen Stewart