PHOTOS: Weekend Brought Christina Aguilera, Sasha Grey, Khloe Kardashian and random hot girl

I don’t know who this is, but she’s hot, so we’ll start last night’s party pictures with her, and then in a second get to porn star Sasha Grey, Christina Aguilera, Alkaline Trio and Khloe Kardashian (down below).

Her name is Alessandra Torresani, future costar in “Caprica,” a “Battlestar Galactica” spinoff. Let’s hope this is her “Battlestar” uniform, as she wore it Friday at Lavo at the Palazzo, eating with Shane West of “E.R.” and other friends. (Photo by Denise Truscello)

Christina Aguilera and her husband Jordan Bratman (left) help launch a bejeweled collection by Stephen Webster (right) on Friday night at Tao at the Venetian. Also in the club were Nicky Hilton, David Katzenberg and DJ AM, the club says. (Photos by Denise Truscello)

Porn star Sasha Grey went to Lavo on Friday to promote the club on the opening night of her mainstream-indie film, “The Girlfriend Experience,” directed by Steven Soderbergh. (Photos by Denise Truscello)

Alkaline Trio rocks The Pearl at The Palms Saturday (Photo by Denise Truscello/WireImage)

Khloe Kardashian and Vanessa Minnillo pose with some Simon G. jewelry at Dos Caminos restaurant at the Palazzo. Also there on Saturday night was Khloe's mom, Kris Jenner, plus songwriter Colby O'Donis, “American Idol” loser Chikezie and R&B group All 4 One, says the club. (Photos by Erik Kabik)

Also at Lavo on Friday was Bethenny Frankel from Bravo’s “The Real Housewives of New York City.” (Photo by Denise Truscello)