Todd Philips and his Hangover crew are off wreaking havoc in Thailand in The Hangover 2, the sequel to their 2009 hit comedy.

Now The Hangover 2 has added an Oscar-nominee to its cast and even managed to snag a former U.S. president to make a cameo in the film, which will also feature a brief appearance by Liam Neeson.

Deadline has confirmed that Paul Giamatti is officially onboard for The Hangover 2 in an as yet unknown role. The man – whose presence in a movie is always a plus – got up to drunken antics of the slightly more somber kind back in 2004’s Sideways and his appearance in this year’s Barney’s Version has been generating Oscar buzz for a while now. Giamatti is a versatile performer who lends an air of authenticity to even his comedic roles and he’ll be a delight to see onscreen alongside the likes of Ed Helms or Zach Galifianakis.

Former U.S. president Bill Clinton was in the capital city of Thailand over the weekend and shot a brief cameo for the Hangover 2, according to People. Is there anything more appropriate than having a (former?) political playboy like Clinton turn up in a Todd Philips’ raunchfest?

There’s no word yet as to what sort of mischief Bradley Cooper, Helms, and Galifianakis will be getting up to in The Hangover 2, though the tomfoolery this time around looks to include a tattoo parlor and Galifianakis becoming a monk (or, at least, shaving off the scruffy mop atop his head).

The Hangover actually had an amusingly mysterious plot that became increasingly complicated as the main trio of characters suffered the repercussions of misremembered acts of debauchery. Hopefully the sequel will up the ante even more.

Philips and Galifianakis’ most recent collaboration, Due Date, is doing well enough in theaters, but the next Hangover promises to be more of a no-holds-barred venture, ripe with deliciously low-brow humor and over-the-top physical comedy – which is exactly what we all want  to see anyway, right?

The Hangover 2 arrives in theaters in the U.S. on May 26th, 2011.

Source: Deadline, People