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Pia Toscano Will Sing on 'Dancing' ... For Mark

He's doing her, and now ... she's doing his show -- TMZ has learned, Pia Toscano will be performing on "Dancing with the Stars" next week ... and get this, her new BF Mark Ballas will dance to her music.

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It's been in the works for a while -- and an hour ago, the deal was sealed.

Pia's performance signifies a borderline incestuous cross-pollination between the two biggest shows on TV ... "American Idol" and "Dancing."

And if that's not enough -- Pia will be back on "Idol" tomorrow for a special cast-off reunion.

Kim Kardashian Babysits For Kourtney & Scott

http://www.usmagazine.com/uploads/assets/articles/40440-kim-kardashian-watched-mason-while-kourtney-partied-in-vegas/1303236949_kardashians-290.jpgWhat happens in Vegas, stays in Vegas!

Kourtney Kardashian's birthday celebrations in Vegas seemed to be pretty tame. The reality star celebrated her 32nd birthday Friday night at the grand opening of Gallery Nightclub at Planet Hollywood Resort & Casino in Las Vegas.

Kardashian was joined by boyfriend Scott Disick, 27. (The two have a 2-year-old son together named Mason.) She wrote on her official blog: "The club was amazing!! I could have people watched for days. Kim Kardashian stayed home with Mason. It was her first night alone with him. They slept in bed together and had a slumber party."

The petite star wore a navy Contrarian dress with black Christian Louboutin pumps. An insider told Us Weekly she danced with friends and sipped champagne throughout the night. The highlight of the evening? Kardashian's birthday cake was presented to her with feather-flashing dancers.

Credit: Us Magazine

Jessica Lowndes: Arthur European Premiere

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Jessica Lowndes attended the European Premiere of Arthur at Cineworld 02 on April 19, 2011 in London, England.

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Credit: Zimbio

Photos by Chris Jackson/Getty Images Europe

Bridget Marquardt's Swimming Pool Photo Shoot

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Showing off her bathing suit body, Bridget Marquardt was spotted doing a photo shoot in Los Angeles today (April 19).

The former “Girls Next Door” starlet looked stunning in a hot pink two-piece as she hammed it up for the camera next to a swimming pool.

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Kourtney Kardashian's 32nd B-day Celebration

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Making for a premature celebration, Kourtney Kardashian rang in her 32nd birthday in Las Vegas, Nevada on Friday night (April 15).

Joined by babydaddy Scott Disick, the "Keeping Up with the Kardashians" cutie's b-day bash coincided with the grand opening of Gallery nightclub at Planet Hollywood Resort and Casino.

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