Twilight

The young hunk showed off his buff and hairless physique -- yet again -- on the set of his new non-vampire flick in Pennsylvania on Thursday.

The super uncomfortable exchange all went down when Sen. Amy Klobuchar had the floor ... and informed Kagan that she had just watched the "The Twilight Saga: Eclipse" movie ... and wanted to know if Kagan was Team Jacob or Team Edward.

Question is ...

Question is ...

Both were over 21 when they became famous for playing teens.

Question is ...

The 23-year-old vamp was spotted out in London with a man friend shopping for underwear.

No tighty whities or banana hammocks for this emo prince.

Congrats!

Find a successful movie and TMZ will find a corresponding lawsuit alleging a shameless ripoff. Case in point - "Twilight."

Summit Entertainment, which owns the trademark to the stylized TWILIGHT trademark, is suing a company that is selling a "Twilight" DVD.

Here's the short story. Summit is releasing a "Twilight" documentary on DVD next month to correspond with the DVD release of "New Moon." The documentary cover features the title, "Twilight in Forks: The Saga of the Real Town," along with an image of a moonlit forest of trees. The back cover features photos of Bella's truck and the "Welcome" sign in Forks, Washington.

Summit claims the defendant, Topics Entertainment, sent copies of a flyer to Best Buy, Sam's Club and Target, advertising its own documentary titled, "Forks: Bitten by Twilight." Summit claims the art on the cover is very similar to the trademarked art and therefore deceptive.

Summit wants to put a quick end to the Topics documentary, asking a judge for an injunction and all sorts of damages.

Kristen Stewart's civic duty involved sex, prostitutes and an undercover cop -- and the guy on trial even got a happy ending.

TMZ has learned Stewart was a member of an L.A. jury this week in a 3-day case involving a man accused of trying to pay an undercover cop for some temporary lovin'.

The defense argued that their client was innocent because he doesn't speak English very well and the whole sex solicitation thing was just a case of lost in translation.

In the end, the "Twilight" star -- along with her peers -- agreed with the defense and found the man not guilty.

When asked if he had someone special for Valentine's Day this year, the 17-year-old said "I wish."

Team Jacob fans ... this is your chance.

Kalika Moquin -- who has vehemently denied an affair with the philandering golf pro -- texted away at The Bank nightclub during a birthday party for "Twilight" star Jackson Rathbone Saturday night. We're told Kalika -- who's now working as a VIP host at the club -- was all business that night.

But Sunday, she let it all hang out -- literally -- donning a breastacular Mrs. Claus costume for "The Annual Vegas Socialite Christmas Party."

Wonder what she's getting in her stocking this year?