Showing off her fabulous form, Kim Kardashian was spotted out on the beach in Santa Monica, California yesterday (April 12).

Joined by her mother Kris Jenner, the “Disaster Movie” babe filmed a commercial for the Skechers Shape Ups line of sneakers.

Credit: Celebrity Gossip

Bridget Marquardt arrives at the American Red Cross, Santa Monica Chapter's Annual Red Tie Affair on April 9, 2011 in Santa Monica, California.

Credit: Zimbio

Paris Hilton arrives at the American Red Cross Santa Monica Chapter's Annual Red Tie Affair on April 9, 2011 in Santa Monica, California.

Credit: Zimbio

Up bright and early for promo duties, Khloe Kardashian was spotted arriving at the MTV building in Santa Monica, CA on Friday (April 8).

The reality TV starlet looked lovely in a pale pink dress and heels as she strutted her stuff inside for an exclusive interview.

Credit: Celebrity Gossip

Kristin Cavallari attends the launch of Kiehl's "Rare Earth Deep Pore Cleansing Masque" on April 7, 2011 in Santa Monica, California.

Credit: Zimbio

Stephanie Pratt attends the launch of Kiehl's "Rare Earth Deep Pore Cleansing Masque" on April 7, 2011 in Santa Monica, California.

Credit: Zimbio

As the temperure hit a record 90 degrees in Southern California on Thursday, lovely Audrina Patridge hit the beach for a sexy bikini photo shoot in Santa Monica, and Radar Online has the sexy shots.

For the shoot, Audrina - joined by her mother - modeled not one, but several brightly colored, teenie weenie bikinis including one with a bright blue bikini top with revealing flowery bottoms.

Credit: Radar Online

Paris Hilton and her sister Nicky Hilton participated in the American Red Cross 'Youth Run 4 Japan', hosted by actor Josh Duhamel, in Santa Monica.

All funds raised from the charity run will go the the American Red Cross Japan Earthquake and Pacific Relief Fund for the relief effort happening in Japan.

Credit: Zimbio

She has never come across as the shy type but Christina Aguilera didn't care who was looking as she packed in the PDA for a passionate make-out session with boyfriend Matthew Rutler, and Radar Online has the pictures.

The pair was spotted passionately making out in the back seat of a chauffeur-driven car as they left Il Ristorante di Giorgio Baldi in Santa Monica, CA. They were in full view of other patrons waiting for their cars and several photographers.

Christina, 30, and Matthew, 25, had hired a driver for the evening. Almost comically, he's seen sneaking a peek in the rear view mirror as the pair acted like naughty teenagers.

Matthew was arrested on March 1 and charged with DUI, after he was pulled over by cops in West Hollywood.

He is currently out on $30,000 bail.

Christina, who was in the passenger seat at the time, was also arrested for public intoxication but released without charge.

Credit: Radar Online

Yesterday (March 24), Audrina Patridge was spotted making her way around town running her errands before ending up at MTV Studios in Santa Monica, CA.

Credit: Zimbio

Pregnant actress Jessica Alba arriving at the Radium/Reel FX Creative Studio in Santa Monica, CA today, March 23, 2011.

Credit: Zimbio

Enjoying a romantic dinner date, Khloe Kardashian and Lamar Odom were spotted out in Santa Monica last night (February 20).

The Keeping Up with the Kardashians babe and her Los Angeles Lakers hubby hit up The Lobster restaurant for some snazzy eats as the paparazzi looked on.

Credit: Celebrity Gossip