Let's get this out of the way first. EVERY film ever made is a "vanity project". Using that tired phrase is a cop-out for lazy reviewers. The entire craft of filmmaking is based on "Look at me/us, aren't I/we wonderful?" whether you are an actor OR director, so let's not overstate the obvious. Jennifer Jason Leigh and Alan Cumming's One Night In The Life of a writer-director/actress couple celebrating thier anniversary with a dozen of thier "closest" show-biz friends is quite entertaining. Very similar in tone to the obscure 80's Austrailian film "Don's Party", the main difference being the Truth Drug of choice...at Don's party, it was that good ol' standby-liquor...in this case, it's the eagerly gobbled "ecstasy" tablets that bring out the inevitable sniping and backbiting amongst the "friends" by party's end. The film has a loose, improvised Cassavettes vibe that may turn off viewers with short attention spans. Good ensemble work (for the most part) from the likes of John C. Reilly, Gwyneth Paltrow, Jennifer Beals and Parker Posey keep things perking. Kevin Kline and Phoebe Cates (and thier real life kids) are standouts, although they are basically playing themselves! The Peter Sellers look-a-like gag is a hoot for cinema buffs. The film is ultimately marred by over-length and one too many anti-climaxes,but Leigh and Cumming should at least be applauded for taking a risk outside the usual Hollywood cookie-cutter frame.