Britney Spears and Demi Lovato make their first official appearance as the judges of X Factor during the 2012 Fox Upfront presentation held at Wollman Rink in New York City on May 14. Britney and Demi join returning judges Simon Cowell and L.A. Reid.

Britney wore a figure-hugging purple Alexander Wang dress and was spotted with her fiance, Jason Trawick, at the X Factor upfront presentation.

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Jenni Pulos, Kyle Richards, Camille Grammer and Rita Wilson all come out to support Bravo’s Andy Cohen at this book release party for Most Talkative: Stories From The Front Lines Of Pop held at SUR Lounge in Los Angeles on May 14.

Perez Hilton shows off his wacky 1980′s-inspired fashion at Andy Cohen’s book release party.

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Jennifer Lopez looks gorgeous in a blush-colored Maria Lucia Hohan gown to the What To Expect When You’re Expecting premiere, held at Grauman’s Chinese Theatre in Hollywood, CA, on May 14th. This silk tulle gown is from the designer’s Fall/Winter 2012 Collection. She accessorized with Norman Silverman diamond bangles (retail $12-$60,000) and two Norman Silverman stackable rings, worth $37,000 each.

Anna Kendrick looks fab in a short blush-colored gown paired with Norman Silverman diamond stud earrings (retail $25,876) at the premiere of What To Expect When You’re Expecting.

Kristen Stewart and Charlize Theron pose with co-star Chris Hemsworth at the world premiere of their new movie, Snow White and the Huntsman, on May 14 at Empire Leicester Square in London, England.

I can totally see vampire Bella wearing this dress in Twilight, but alas, Kristen is promoting her new movie Snow White and The Huntsman. Kristen looked amazing in a Marchesa sheer black lace gown paired with Jimmy Choos heels. Charlize wore a gorgeous Christian Dior Haute Couture gown.

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Will Smith, Josh Brolin and Nicole Scherzinger attend the Men in Black 3 premiere on May 14 in Berlin, Germany at O2 World.

Nicole Scherzinger, who plays Lilly in the new Men in Black 3, looks amazing in a purple Herve L. Leroux dress paired with Norman Silverman diamond hoops that retail for $38,500.

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Bachelor couple Ben Flajnik and Courtney Robertson arrived to Joico’s On the Go Mother’s Day bash co-sponsored by Voli Light Vodka with Ben’s mother, Barbara, and sister, Julia. The foursome were spotted at the Voli Light Vodka bar chatting with E! Entertainment’s Ashlan Gorse. Courtney’s drink of choice was a spicy Bloody Mary.

Courtney and Ben’s mother, Barbara, had fun bonding while they got their hair and nails done with Joico’s George Papanikolas.

Lisa Rinna attended the Joico On the Go Beauty Mother’s Day event with her daughter, Amerlia Grey, who is almost 11 years-old. Amelia didn’t let the fact that her arm was in a cast stop her from having fun at the Cuddle Covers lounge. Lisa and Amelia were also spotted bonding as they made bracelets at Blessed Charms.

Maria Lopez’s wife-to-be, Courtney Mazza, arrived with their adorable daughter, 21 month old Gia, who enjoyed Sweet Lollipops from Swurlz. Courtney was spotted sipping on Serenitea and picked up makeup from NYX Cosmetics.