Samantha Ronson hit The Roosevelt in Hollywood Tuesday night to support the launch of her sister Charlotte's I "Heart" Ronson line at JCPenney's.

Ronson DJ-ed at the party, presented by Svedka Clementine Vodka, which was attended by Zac Efron, Nicole Richie, Paris and Nicky Hilton, Ashlee Simpson, Jordana Brewster, Alice Eve and Danny Masterson.

Of course, Ronson's ex Lindsay Lohan could not attend since she's currently under court-mandated house arrest.

Check out a pic of Samantha DJ-ing at the event after the jump, and see Zac Efron in our gallery below. He made quite the exit!

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Paris Hilton and sister Nicky hit up The Roosevelt Tuesday night for Svedka Clementine Vodka's party for Samantha Ronson's sister, Charlotte, and her new clothing line at JCPenney. At the event, the Hilton sisters ran into old friend Nicole Richie for the second night in a row!

The three had also all been at Britney Spears' Monday night concert in LA. Paris and Nicole seemed friendly; they greeted each other with a hug.

Paris announced earlier in the evening on The George Lopez Show that she had officially broken up with boyfriend Cy Waits. She wastes no time in enjoying the single life!

Check out more pics after the jump and in our gallery below!

Columbia

Beyonce's new album 4 is set to hit stores on June 27, however Columbia Records executives are reportedly worried the album will flop due to a lack of hit songs, according to the NY Post.

An insider tells the Post:

"They're very nervous about Beyonce's new record. It doesn't have the hit songs that her fans are used to. They asked her to make changes, but she said no."

As for Beyonce's career, a source adds:

"Beyonce's career has stalled a bit. Columbia seems to think they can get some mileage out of a comeback record with all of the girls."

And by girls ... they're referring to Destiny's Child. Do you think the group could make a comeback?

Read how Beyonce's website describes her upcoming album ... after the jump.

Anna Paquin, Stephen Moyer, Alexander Skarsgard and the stars of True Blood hit the Arclight Hollywood theater Tuesday night for a screening of the season four premiere of the show.

Skarsgard looked hot as usual (see our gallery below,) but the hotter news was Amanda Seyfried! She isn't on the show, but attended the afterparty and was spotted leaving with a mystery man!

Seyfried, who is newly single from Ryan Philippe after eight months of dating, grabbed a meal with ex Dominic Cooper only this past weekend. Enjoy being a single lady, Amanda!

Check out Amanda and the guy in our video below, and see video of all the stars of True Blood at the premiere after the jump!

Nicki Minaj was out at Kastuya in Hollywood Tuesday night, where she was spotted holding hands with a mystery man. Of course ... the hand-holding might not have represented a love connection. When asked what it would take for a gay rapper to be successful, Minaj replied: "I am a gay rapper. You got one." Yowza!

Minaj also spoke about her tour with Britney Spears; she's in LA for the performances. See what she said in the video, and check out pictures of Ms. Nicki after the jump!

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On today's X17 Live, X17online's Marco Gonzalez brings you exclusive video of Johnny Knoxville speaking about the tragic death of his friend Ryan Dunn, Britney Spears releases her latest video for "I Wanna Go," new photos of LeAnn Rimes looking shockingly thin, two big breakups here in Hollywood ... and more!

Twilight co-stars Kristen Stewart and Taylor Lautner hit The Los Angeles Film Festival for the world premiere of A Better Life Tuesday night, and we're happy to say Kristen was actually smiling!

Maybe Taylor's good 'tude rubs off on her. The flick is directed by Chris Weitz, who directed 2009's Twilight: New Moon. How nice of Taylor and Kristen to show their support! Kristen's beau Robert Pattinson was not there, but he's currently on location filming a new movie.

Check out video of Taylor and Kristen at the premiere after the jump!

The singles that play together ... do what together?

Newly single (from both Ryan Reynolds and Sean Penn) Scarlett Johansson, 26, had a late night out with newly single Justin Timberlake, 30, (he split from longtime gf Jessica Biel in March) Tuesday night.

The two partied at Kenmare in New York City until 3:30 a.m.