Lady Gaga, boyfriend Luc Carl, hit up Oak Room for impromptu concert and some dancefloor PDA

Lady Gaga shocked patrons at the Plaza Hotel’s Oak Room when she unexpectedly swanned into the nightclub with beauLuc Carlto hear her friend, jazz musicianBrian Newman, who performs there on Wednesday nights.

A source at the club tells usGagaand Carl arrived with bodyguards in aRolls-Royceand anEscalade, and entertained the audience with a little song and dance, though not in that order.

After managers drew the club's window shades to keep out prying eyes, Gaga and Carl danced and kissed in the center of the room while Newman serenaded them withFrank Sinatrasongs.

To the audience's delight, the Fame Monster then joined Newman onstage (as she did in September), to sing six numbers, including George andIra Gershwin's"Someone to Watch Over Me."

When Gaga first took the mic, our source says, she was holding a martini that she claimed was her fifth. But you couldn't say she was feeling no pain. After telling the crowd she was happy to be back at the Oak Room, Gaga said she felt bad for theCentral Parkhorses that were out in the cold. Aww.

TheKnicksare hot stuff

Do the ladies prefer to party with Knicks or Giants? According to a highly unscientific report from the front lines at Greenhouse, it's a slam-dunk for the Knicks. A clubgoer tells us a group of Knicks that includedRonny Turiaf,Roger Mason Jr.,Toney Douglas,Landry FieldsandRaymond Feltonarrived at theSoHohot spot after their victory against theSpursand were soon"balling out"with more than 15 hotties crowded around and more trying to make it past security.

The Giants crew ofAntrel Rolle,Keith BulluckandVictor Cruzdidn’t fare so well. Our source says they attracted"ike, three or four hot girls at a time." 

Method acting Carrey  

Is Jim Carrey still in character as the gay con artist he played in "I Love You Phillip Morris?"At a recent performance of"Spider-Man: Turn Off the Dark,"Carrey was overheard at intermission telling a fan about his newfound"man-crush"on angel-faced Spidey starReeve Carney.

Dastardly Darren

At theFilm Society of Lincoln Center's Q&A with"Black Swan"directorDarren Aronofskyon Wednesday,  an elderly ballet devotee from the audience demanded to know whyMila Kunis' character in the film had a tattoo."Ballerinas don't have tattoos!"insisted the woman, who also asked why"Black Swan"was"so unnecessarily grotesque.""I'm sorry if I upset and offended you,"a laughing Aronofsky replied,"but beware of my films."

Headlock to liplock

­Reality TV romance could be getting even rougher. WWE divaAshley Massarois developing a show on which suitors would compete in mixed martial arts to win her hand. Massaro told us one possible contestant isLeslie Harriman, a professional kick boxer andDwayne (The Rock) Johnsonlook-alike whom she recently met at the Chelsea Room. Possible deal-breaker?"He couldn't do the eyebrow,"she said.

 Break a leg

Astonishing tales is getting interesting buzz. The indie musical duo ofHenry BloomfieldandDavis Vigneaultwill make theirNYCdebut Friday at 11 at the National Underground on E. Houston St. The New Englanders, who met at theGroton School, look like they stepped out of an Abercrombie& Fitch catalogue and sound like a jazzierRadioheadwithBen Foldson piano. Got it?

WithCarson GriffithandMolly Fischer

cgriffith@nydailynews.com,mfischer@nydailynews.com

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