Rowdy, raunchy and spectacularly, confidently stupid, "Wedding Crashers" is a welcome return to the grand tradition of crass boys' club comedies that has suffered in these PG-13 saturated times. It is politically incorrect, sexist, gratuitous and somehow still sweet in its big dumb way. And yes, it's a hoot.

Vince Vaughn and Owen Wilson, charter members of the new Hollywood frat pack (which is unofficially led by Ben Stiller and also includes Owen's brother Luke Wilson, Jack Black and Will Ferrell) star as divorce mediators who love to crash weddings. They follow engagement announcements, concoct fictional identities and relations to the bride and groom and spend each spring and summer partying madly.

Why weddings? Because weddings make unattached ladies feel, uh, romantic and yearn for attachment. John Beckwith (Wilson) and Jeremy Klein (Vaughn) are more than willing to provide such attachment. On a temporary basis, of course.

Love, of course, ruins everything. Jeremy and John have just blustered their way into the biggest wedding of the Washington, D.C., season, the nuptials for a daughter of Secretary of the Treasury William Cleary (Christopher Walken), when John spies a sister of the bride, Claire (Rachel McAdams) and falls for her badly. As luck good or bad would have it, Jeremy also gets involved with a Cleary sister, the spoiled vixen Gloria, played by Isla Fisher, who nearly steals the movie.

So the two crashers find themselves invited to a post-wedding family weekend on a nearby island with the secretary, his randy wife (Jane Seymour), the Cleary girls and Claire's possessive jerk boyfriend (Bradley Cooper).

At this point, John and Jeremy wander off in separate directions, both falling badly. The difference is that John is falling ever more in love with a women who thinks he's someone he's not. Jeremy, meanwhile, is just plain pratfalling as Vaughn takes on most of the comedic chores, which, among other things, involve football, bondage, dinner disturbances and a gay crush.

The film loses a bit of steam after the island weekend as the boys have a falling out, but a brilliant cameo appearance and your basic almost-heartfelt finale send the film off with plenty of laughs.

As in any good comedy, chemistry is essential, and the chemistry not only between Vaughn and Wilson but also with the ladies involved is this film's strongest suit. McAdams, who made such a splash last year with both "Mean Girls" and "The Notebook," is appropriately luminous, and Fisher is an absolute wild card. The film's best moments involve her and Vaughn, each outdoing the other while building their scenes together. Wilson is in comparatively subdued dude mode here, love struck yet still able to ramble off on funny tangents.

And that's what "Wedding Crashers" is, a funny tangent, a silly summer comedy that won't be denied. No one's going to mistake it for a major piece of cinema, but it's the rare person who won't find themselves consistently laughing aloud while watching it. This is one reception you won't want to miss.

Rated R for sexual content, nudity and language.