Party All The Time

We shot video of B.Z. leaving Villa last night in West Hollywood on his tricked-out bike -- little horn and all. Billy looks totally sober, but it got us thinking ... could a celeb, or you for that matter, dodge a DUI by jumping on a Schwinn rather than hopping in a BMW? The answer: Nope.

We checked with two police departments. In California, at least, there's actually a crime -- Driving Under the Influence on a Bicycle. It's a misdemeanor, cops can demand you take a field sobriety or blood alcohol test, and you can be arrested and jailed.

Rihanna had a damn good reason to hit the Hollywood club scene last night -- she was finally attending her long-delayed 21st birthday party ... complete with loads of booze, a couple of decoys and NO Chris Brown in sight.

Sources tell TMZ the whole thing went down in a private patio at Coco de Ville. We're told a five-person party ordered everything from Grey Goose to Jack Daniels, a round of "fun" shots, some champagne, and a cupcake tower for the birthday girl.

TMZ has also learned Rihanna had planned to use a couple of decoys to keep her exit a secret, but TMZ cameras managed to get a shot anyway.

RiRi turned 21 on February 20 -- 12 days after the brutal fight with Brown. Relationships are complicated.

Kevin spent the night at Harrahs Casino -- possibly doubling down on the $5k. Wouldn't be a shock. After all, he has dice tattooed on his wrist.

Happening hot spot Bellevue, Wa. was supposed to be the scene for a big New Year's Eve shindig hosted by Ne-Yo. And it probably would have been awesome ... if only he showed up.

According to a lawsuit filed last week in Maryland, Wet Entertainment booked Ne-Yo for the NYE gig and paid him $95,000 up front. The organizers claim they made all sorts of arrangements for the show -- promotion, travel, hotel, etc.

They claim Ne-Yo's people made it to Washington -- but no Ne-Yo. The show was 86'd.

Wet is suing Ne-Yo and the booking company that made the deal for the $95K plus more than $1 mil in damages.

Sadly, this is the best picture Cuba has been in since "Jerry Maguire."

As McLean nearly falls into the street, one of his friends calls him out -- right out in the middle of Hollywood -- emotionally confronting the guy who went to rehab for alcohol and cocaine abuse in 2001... and again in 2002.

Witnesses inside the Key Club say they saw McLean taking shots and drinking beers during the show. After the confrontation, McLean's friends forced him into a cab and sent him home.

Though one hand was holding Angelina's as he left a European premiere for "Benjamin Button", his other firmly grabbed an open bottle of Krombacher, a German beer. No -- he wasn't driving.

When not starring in films or being a good Samaritan by helping transport transvestite prostitutes in the wee hours of the morning, the 47-year-old father of who-knows-how-many likes to indulge his lyrical tendencies.

TheDirty.com was able to get a copy of Sir Charles Barkley's receipt from the Dirty Pretty Rock Bar where Chuck, Jaleel White (aka Urkel) and Michael Strahan partied well into the morning.