'The Hangover 2' Cast: Who's In And What's Going On With The Plot?

With all the casting rumors swirling around "The Hangover 2," it's hard to know exactly what in the name of Mike Tyson's pet tiger will be going on in the sequel to the highest-grossing R-rated comedy of all time.

Is Liam Neeson playing the role of the deranged Bangkok tattoo artist that was originally intended for Mel Gibson? Or will that part go to Paul Giamatti, who along with former President Clinton, just signed on for a cameo? And what happened to Heather Graham's stripper with a heart of gold and her son nicknamed "Carlos"?

The Hangover 2 cast

Click on the image above for a gallery of the actors and actresses who'll be gracing the screen in "The Hangover 2," and hit the jump for a rundown of what we know so far about what's in store for them in the sure-to-be-raunchy sequel.

Another Bachelor Party?

Though the finale of "The Hangover" made it look like Stu (Ed Helms) and Jade (Graham) were destined for true love, Graham reportedly won't be back for the sequel. But Stu seems to have moved on rather quickly. "Sucker Punch" star Jamie Chung was recently cast as Stu's fiancee, stoking rumors that the trip to Thailand would be another debauchery-laden bachelor party for the boys. And it looks like Doug (Justin Bartha) will actually get to join Stu, Phil (Bradley Cooper) and Alan (Zach Galifianakis) for the fun this go-around.

Stu Gets a Tattoo

Despite recent rumors that Liam Neeson might be playing a role other than the tattoo artist part he inherited from Mel Gibson, we're betting he'll be the sequel's Bangkok inking master. But whether it's Neeson or the newly-signed Giamatti doing some skin etching, a photo from TMZ pretty much confirms that Stu is the lucky recipient of the artist's handiwork.

Bring on the Monica Lewinsky Jokes

With former President Bill Clinton playing himself in a small cameo, we're betting at least a few Lewinsky-gate gags (no pun intended).

Are We In Store For a Flashback?

Judging by the cast list on IMDb, it looks like that just might be in the cards. According to the site, kid actors William A. Johnson and Aedin Mincks are set to play young version of Stu and Alan, respectively. And here we thought those guys just met at Doug's bachelor party. Hmmm... consider our interest piqued.

What do you think of "The Hangover 2" cast so far? Do you like the way it's coming together? Share you thoughts in the comments!