Is Josh Hartnett harboring a secret Heidi fantasy? Seems his eye may have been caught by the bizarre Bavarian milkmaid braid Sienna Miller sported at the Golden Globes.

People reports the unibrowed actor, 28, enjoyed an animated, hour-long confab on a couch at Hollywood's Chateau Marmont Tuesday night with the repeat ex of Jude Law.

But did their "cozy" gabfest segue into groping?

The mag says things soon took a turn for the touchy-feely when Hartnett, who last month was seen sucking face with sometime squeeze Scarlett Johansson and supermodel Gisele Bundchen, held onto Miller's thigh as she stood in front of him.

Later, the pair took their cocktails to go and wandered out to the hotel's pool area together.

But don't attempt to mash their monikers into an annoying nickname just yet. Reps for both stars are denying there's any hanky-panky afoot.

"They're friends, just friends," Sienna's flack insists to People. "They were just hanging out."

Echoes Hartnett's more succinct mouthpiece, "There is nothing to comment on."

Meanwhile, Miller gave her seemingly sparkling conversational skills a workout on the Globe party circuit as she schmoozed with both Leonardo DiCaprio and Sean Combs.

Sienna and Leo, who were briefly linked a while back (she has repeatedly brushed off the romantic rumblings), had a tête-à-tête at Prince's post-ceremony soiree at the Beverly Wilshire hotel, says People.

At one point, adds E!, the A-list actor, who's been romancing Israeli model Bar Rafaeli for more than a year, was seen with his arm around Miller.

Earlier in the evening, the actress traded digits with Diddy, who was hanging with Jamie Foxx at the In Style bash.

"Diddy and Jamie Foxx were sitting together," an insider tells the New York Daily News, "but when Diddy saw Sienna, he went over to meet her. He got her cell phone number and invited her to sit with them."

The mole says Diddy's intention was to catch up with Sienna later that night at CAA's soiree, but his plan was foiled by security.

"Do you know who I am?" the paper quotes him as huffing, prompting the fete's female gatekeeper to fire back, "I know exactly who you are, and you're not invited."

As for Sienna, she's set the bar depressingly low for her future beaus, admitting in the latest issue of Esquire that Law's tabloid-topping nanny-nuzzling led her to readjust her romantic expectations.

"We had our problems, but every single person I know has experienced infidelity," says Miller. "It's not the first time it's happened to me, and it probably won't be the last."

Despite her gloom-and-doom attitude toward amour, Sienna tells the mag she's "pathologically optimistic."