Updated January 06, 2004 01:00 PM

Valentine’s Day is more than a month away, but PEOPLE is already clocking some hot cupid action around Hollywood, starting with “Angels in America” star Patrick Wilson’s case of, well, Scarlett Fever.

The handsome actor, 30, is seeing none other than “Lost in Translation” and “Girl with a Pearl Earring” sensation Scarlett Johansson, 19, the magazine reports in its latest issue.

A source close to the actors, who are both nominated for Golden Globe awards (she for the two movies, he for HBO’s “Angels”), tells PEOPLE, “They’re dating, but not exclusively.”

Both Johansson and Wilson are expected to attend the Jan. 25 Golden Globe ceremony — but not together.

As for other seemingly and/or genuine Valentines, the magazine notes that although Matt Damon, 33, and Eva Mendes, 29, had a good time in Las Vegas over the New Year’s holiday with Ben Affleck and Jennifer Lopez and a posse of friends, the couple is not really a couple, says Damon’s rep, who adds that Mendes’s boyfriend was with the “Stuck on You” actress most of the time.

Meanwhile, Paris Hilton, the 22-year-old star of “The Simple Life” (and a famous video with somewhat lower production values), and Backstreet Boy Nick Carter, 23, are indeed a couple, at least for the moment. “Paris will settle down eventually,” says her sister Nicky, 20. “But she just has such a little attention span to concentrate on a relationship.”

And then there are Mark Wahlberg and Jessica Alba, who spent Dec. 30 cozying up to one another at the hip eatery Nobu in Miami Beach. “They were looking into each other’s eyes,” says one onlooker.

On New Year’s Eve, Alba, in a short white dress, and Wahlberg, in a shirt and jeans, rang in 2004 at Miami Beach’s Delano Hotel with filet mignon and champagne. Says a source at the hotel: “They are into each other big time.”

Then again, it could just be a rebound kind of thing: Alba, 22, split from her “Dark Angel” costar Michael Weatherly, 35, last summer, while Wahlberg, 32, broke up with model Rhea Durham, 25, with whom he has a 4-month-old daughter, Ella Rae.