KEVIN SPACEY shocked revellers at a wild party in Croatia when he pulled a male pal’s trousers down and groped his buttocks.

The American Beauty star was snapped on holiday in Hvar getting to grips with the bare butt as his friend lay across his lap.

An onlooker said: “Kevin looked like he was a having a brilliant time.

“Most of his friends were laughing, but I couldn’t see the face of the man whose butt it was.”

A mystery! Could it have been the shirtless Ryan Gosling lookalike Spacey's recently been sighted with in Sarajevo? A penitent Bryan Singer, apologizing for the impending, possibly Spacey-less Superman reboot? Or, somehow, was it Spacey spanking himself, and the clues were there all along? Though logistically unlikely, we wouldn't put anything past the former Keyser Söze. After all, as Benicio Del Toro's Fenster would say, "Mmmfmfmsmmahhh."

[Photo Credit: Bauer-Griffin]

• A Bum Deal for Kevin Spacey [The Sun]

1. 21 - $15.1 million
The geeks-take-Vegas opus shocked observers by not only sustaining its top spot for a second consecutive week, but also by outlasting consistently sluggish reviews (thus establishing critics' rumored irrelevancy beyond a doubt and putting in motion a unilateral purge of the eight remaining full-time reviewers working in the United States).

2. Leatherheads - $13.4 million
George Clooney's latest directorial/starring effort was easily the week's most stirring disappointment, pulling in woefully less than the $20 million forecast by observers last week. Analysts point out potential stumbling blocks from a misleading marketing campaign to a football film opening on a basketball/baseball weekend, but let's face it: No film can survive an opening-weekend torpedo from the influential critical duo Reel Geezers, who "felt bad for the cameramen and everyone involved."

3. Nim's Island - $13.3 million
Before this morning we'd never even heard of this movie, the script for which a Fox executive is said to have discovered under his passenger seat while searching for his dropped Bluetooth earpiece. Was this actually released, or was this just a WGA-engineered ploy to make its newly fi-core archenemy Clooney feel worse about Leatherheads?

4. Horton Hears a Who! - $9.1 million
Plunging nearly 50 percent from its bridesmaid perch last week, Horton nevertheless sustained a Top-5 berth. Jim Carrey spent the weekend calculating the dynamics of his newfound leverage, which should be just enough to get his and Spike Jonze's Ripley's Believe it or Not adaptation pushed up to a 2017 release.

11. Stop-Loss - $2.3 million
Is Hollywood out of touch when it comes to the Iraq War? Oh, wait.

1. 21 - $23.7 million
Tempting the odds by releasing their M.I.T.-geniuses-grift-Vegas movie on thousands of screens across the country paid off handsomely for Sony, though weak reviews and poor word-of-mouth (there was much grumbling about the plausibility of one sequence in which—spoiler alert!—Kate Bosworth detonates a suspicious dealer's skull with her high-frequency brain waves) could mean a steep drop-off in the coming weeks.

2. Dr. Seuss' Horton Hears a Who! - $17.425 million
2008's first bona fide hit held strong in the second position, buoyed by repeat business from families who loved its sophisticated take on the child-friendly material, and balls-tripping Salvia addicts, for whom the title character of this deeply religious experience was the re-embodiment of Ganesh.

3. Superhero Movie - $9.51 million
Despite the best efforts of World's Greatest Tom Cruise Impressionist Miles Fisher, the universally panned superhero parody movie was largely ignored by the moviegoing public, who realized they could probably get more consistent belly-laughs in the genre by Netflixing Billy Zane's turn as The Phantom.

4. Tyler Perry's Meet the Browns - $7.76 million
Continuing to grow his signature drag character in challenging ways keeps paying off for Tyler Perry, as fans who show up to Browns expecting some of that sweet n' salty Madea wisdom wind up surprisingly moved by her hysterectomy.

5. Drillbit Taylor - $5.8 million
8. Stop-Loss - $4.525 million
We think we have a definitive answer to our question about the ability of a shirtless Ryan Phillippe and Channing Tatum to lure audiences into an Iraq War movie: The film's paltry gross suggests that not even their sun-speckled abs could render the depressing material any easier to take. Drillbit Taylor's bodyguard-with-the-sad-behind-his-eyes seemed positively sunny by comparison.

• WEEKEND BOX OFFICE March 28-30, 2008 [Box Office Mojo]

First, we present the leading men we suspect Kate had no problems getting down and dirty with, from Brandon Routh in Superman Returns to surfer boy Matt Davis in Blue Crush (at right). And though Kate claims some booze was consumed before making out with Jim in 21, we're pretty sure she didn't turn to her stash carefully hidden in the wardrobe department just so she could get through the shoot, judging by this image of him from the movie, at center.

But what of these three? In the college sex 'n drugs flick Rules of Attraction, Kate had to go at it with spikey-haired, long-faced James Van Der Beek, who played a drug-addled violent kid causing trouble. We suspect pills in the benzo category were required; maybe a little Valium or Ativan to numb herself out take after take. And then there was that gruesome bathroom sex scene with Val Kilmer in Wonderland. Kilmer can certainly be a looker when he cleans up, but playing (yup, another) druggie with greasy hair and a ten-o-clock shadow, we're guessing Kate hit the gin hard before getting banged around for this scene. And finally we come to the lovely Kevin Spacey, her other 21 co-star. Personally we wouldn't mind making out with Kev sober, but that's only if we figure out a way to unplug our gaydar. We figure Kate just smoked a joint or two and imagined a parallel universe in which all those gay rumors didn't exist.

Cheers to Kate for proving that sex scenes, no matter who you do 'em with, can be one big high after another.

• KATE BOSWORTH BLACKS OUT HER STEAMY '21' LOVE SCENE [People]